Update dependency docker/docker to v26.1.0 (#46)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [docker/docker](https://togithub.com/docker/docker) | minor | `26.0.2`
-> `26.1.0` |

---

### Release Notes

<details>
<summary>docker/docker (docker/docker)</summary>

### [`v26.1.0`](https://togithub.com/moby/moby/releases/tag/v26.1.0)

[Compare
Source](https://togithub.com/docker/docker/compare/v26.0.2...v26.1.0)

#### 26.1.0

For a full list of pull requests and changes in this release, refer to
the relevant GitHub milestones:

- [docker/cli, 26.1.0
milestone](https://togithub.com/docker/cli/issues?q=is%3Aclosed+milestone%3A26.1.0)
- [moby/moby, 26.1.0
milestone](https://togithub.com/moby/moby/issues?q=is%3Aclosed+milestone%3A26.1.0)
- Deprecated and removed features, see [Deprecated
Features](https://togithub.com/docker/cli/blob/v26.1.0/docs/deprecated.md).
- Changes to the Engine API, see [API version
history](https://togithub.com/moby/moby/blob/v26.1.0/docs/api/version-history.md).

##### New

- Add configurable OpenTelemetry utilities and basic instrumentation to
commands.
For more information, see [OpenTelemetry for the Docker
CLI](https://docs.docker.com/config/otel).
[docker/cli#4889](https://togithub.com/docker/cli/pull/4889)

##### Bug fixes and enhancements

- Native Windows containers are configured with an internal DNS server
for container name resolution, and external DNS servers for other
lookups. Not all resolvers, including `nslookup`, fall back to the
external resolvers when they get a `SERVFAIL` answer from the internal
server. So, the internal DNS server can now be configured to forward
requests to the external resolvers, by setting `"features":
{"windows-dns-proxy": true }` in the `daemon.json` file.
[moby/moby#47584](https://togithub.com/moby/moby/pull/47584)

> \[!NOTE]
> This will be the new default behavior in Docker Engine 27.0.

> \[!WARNING]
> The `windows-dns-proxy` feature flag will be removed in a future
release.

- Swarm: Fix `Subpath` not being passed to the container config.
[moby/moby#47711](https://togithub.com/moby/moby/pull/47711)
- Classic builder: Fix cache miss on `WORKDIR <directory>/` build step
(directory with a trailing slash).
[moby/moby#47723](https://togithub.com/moby/moby/pull/47723)
- containerd image store: Fix `docker images` failing when any image in
the store has unexpected target.
[moby/moby#47738](https://togithub.com/moby/moby/pull/47738)

</details>

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os/ubuntu-20.04/Earthfile

@@ -10,7 +10,7 @@ ARG --global OS_IMAGE=ubuntu
 
 ARG --global OS_VERSION=20.04
 # renovate: datasource=github-releases depName=docker/docker
-LET docker_package_version=26.0.2
+LET docker_package_version=26.1.0
 ARG --global DOCKER_VERSION=5:$docker_package_version-1~ubuntu.$OS_VERSION~focal
 
 # DIR_PATH is set to that common targets can call os specific targets. It should match the directory name this Earthfile is located in