build(deps): bump tokio from 1.20.1 to 1.26.0 (#135)

Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.20.1 to 1.26.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/tokio-rs/tokio/releases">tokio's
releases</a>.</em></p>
<blockquote>
<h2>Tokio v1.26.0</h2>
<h3>Fixed</h3>
<ul>
<li>macros: fix empty <code>join!</code> and <code>try_join!</code>
([https://redirect.github.com/tokio-rs/tokio/pull/5504])</li>
<li>sync: don't leak tracing spans in mutex guards
([https://redirect.github.com/tokio-rs/tokio/pull/5469])</li>
<li>sync: drop wakers after unlocking the mutex in Notify
([https://redirect.github.com/tokio-rs/tokio/pull/5471])</li>
<li>sync: drop wakers outside lock in semaphore
([https://redirect.github.com/tokio-rs/tokio/pull/5475])</li>
</ul>
<h3>Added</h3>
<ul>
<li>fs: add <code>fs::try_exists</code>
([https://redirect.github.com/tokio-rs/tokio/pull/4299])</li>
<li>net: add types for named unix pipes
([https://redirect.github.com/tokio-rs/tokio/pull/5351])</li>
<li>sync: add <code>MappedOwnedMutexGuard</code>
([https://redirect.github.com/tokio-rs/tokio/pull/5474])</li>
</ul>
<h3>Changed</h3>
<ul>
<li>chore: update windows-sys to 0.45
([https://redirect.github.com/tokio-rs/tokio/pull/5386])</li>
<li>net: use Message Read Mode for named pipes
([https://redirect.github.com/tokio-rs/tokio/pull/5350])</li>
<li>sync: mark lock guards with
<code>#[clippy::has_significant_drop]</code>
([https://redirect.github.com/tokio-rs/tokio/pull/5422])</li>
<li>sync: reduce contention in watch channel
([https://redirect.github.com/tokio-rs/tokio/pull/5464])</li>
<li>time: remove cache padding in timer entries
([https://redirect.github.com/tokio-rs/tokio/pull/5468])</li>
<li>time: Improve <code>Instant::now()</code> perf with test-util
([https://redirect.github.com/tokio-rs/tokio/pull/5513])</li>
</ul>
<h3>Internal Changes</h3>
<ul>
<li>io: use <code>poll_fn</code> in <code>copy_bidirectional</code>
([https://redirect.github.com/tokio-rs/tokio/pull/5486])</li>
<li>net: refactor named pipe builders to not use bitfields
([https://redirect.github.com/tokio-rs/tokio/pull/5477])</li>
<li>rt: remove Arc from Clock
([https://redirect.github.com/tokio-rs/tokio/pull/5434])</li>
<li>sync: make <code>notify_waiters</code> calls atomic
([https://redirect.github.com/tokio-rs/tokio/pull/5458])</li>
<li>time: don't store deadline twice in sleep entries
([https://redirect.github.com/tokio-rs/tokio/pull/5410])</li>
</ul>
<h3>Unstable</h3>
<ul>
<li>metrics: add a new metric for budget exhaustion yields
([https://redirect.github.com/tokio-rs/tokio/pull/5517])</li>
</ul>
<h3>Documented</h3>
<ul>
<li>io: improve AsyncFd example
([https://redirect.github.com/tokio-rs/tokio/pull/5481])</li>
<li>runtime: document the nature of the main future
([https://redirect.github.com/tokio-rs/tokio/pull/5494])</li>
<li>runtime: remove extra period in docs
([https://redirect.github.com/tokio-rs/tokio/pull/5511])</li>
<li>signal: updated Documentation for Signals
([https://redirect.github.com/tokio-rs/tokio/pull/5459])</li>
<li>sync: add doc aliases for <code>blocking_*</code> methods
([https://redirect.github.com/tokio-rs/tokio/pull/5448])</li>
<li>sync: fix docs for Send/Sync bounds in broadcast
([https://redirect.github.com/tokio-rs/tokio/pull/5480])</li>
<li>sync: document drop behavior for channels
([https://redirect.github.com/tokio-rs/tokio/pull/5497])</li>
<li>task: clarify what happens to spawned work during runtime shutdown
([https://redirect.github.com/tokio-rs/tokio/pull/5394])</li>
<li>task: clarify <code>process::Command</code> docs
([https://redirect.github.com/tokio-rs/tokio/pull/5413])</li>
<li>task: fix wording with 'unsend'
([https://redirect.github.com/tokio-rs/tokio/pull/5452])</li>
<li>time: document immediate completion guarantee for timeouts
([https://redirect.github.com/tokio-rs/tokio/pull/5509])</li>
<li>tokio: document supported platforms
([https://redirect.github.com/tokio-rs/tokio/pull/5483])</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/tokio-rs/tokio/commit/a377240bbf09f120a6d522651dae3752a180f18c"><code>a377240</code></a>
chore: prepare for Tokio v1.26.0 release (<a
href="https://redirect.github.com/tokio-rs/tokio/issues/5521">#5521</a>)</li>
<li><a
href="https://github.com/tokio-rs/tokio/commit/52da177dea169aa9f3dac6b1465fa5229a9615bb"><code>52da177</code></a>
metrics: add a new metric for budget exhaustion yields (<a
href="https://redirect.github.com/tokio-rs/tokio/issues/5517">#5517</a>)</li>
<li><a
href="https://github.com/tokio-rs/tokio/commit/ee1c940709ad88f83daea29612a924524e37d173"><code>ee1c940</code></a>
time: Improve <code>Instant::now()</code> perf with test-util (<a
href="https://redirect.github.com/tokio-rs/tokio/issues/5513">#5513</a>)</li>
<li><a
href="https://github.com/tokio-rs/tokio/commit/815d89a407beef40e009efdc7c31716b34449630"><code>815d89a</code></a>
runtime: remove extra period in docs (<a
href="https://redirect.github.com/tokio-rs/tokio/issues/5511">#5511</a>)</li>
<li><a
href="https://github.com/tokio-rs/tokio/commit/54aaf3d0e30f0d352a54e11f8543d96a380e6469"><code>54aaf3d</code></a>
time: document immediate completion guarantee for timeouts (<a
href="https://redirect.github.com/tokio-rs/tokio/issues/5509">#5509</a>)</li>
<li><a
href="https://github.com/tokio-rs/tokio/commit/5a3abe56eeb03b383a994375026b370161a05946"><code>5a3abe5</code></a>
net: add types for named unix pipes (<a
href="https://redirect.github.com/tokio-rs/tokio/issues/5351">#5351</a>)</li>
<li><a
href="https://github.com/tokio-rs/tokio/commit/d44b1ca9c8fdf6392d7b5b625bef49d141de79f1"><code>d44b1ca</code></a>
io: ignore SplitByUtf8BoundaryIfWindows test on miri (<a
href="https://redirect.github.com/tokio-rs/tokio/issues/5507">#5507</a>)</li>
<li><a
href="https://github.com/tokio-rs/tokio/commit/e23c6f3935b550ddb7587232c423145e06087551"><code>e23c6f3</code></a>
signal: updated Documentation for Signals (<a
href="https://redirect.github.com/tokio-rs/tokio/issues/5459">#5459</a>)</li>
<li><a
href="https://github.com/tokio-rs/tokio/commit/0a50cb3baa7493e82f5154e38d76a6cff7337676"><code>0a50cb3</code></a>
net: fix test compilation failure (<a
href="https://redirect.github.com/tokio-rs/tokio/issues/5506">#5506</a>)</li>
<li><a
href="https://github.com/tokio-rs/tokio/commit/2298679af4f7b48ac181b54a3c526391d47c94b1"><code>2298679</code></a>
runtime: document the nature of the main future (<a
href="https://redirect.github.com/tokio-rs/tokio/issues/5494">#5494</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/tokio-rs/tokio/compare/tokio-1.20.1...tokio-1.26.0">compare
view</a></li>
</ul>
</details>
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