Update dependency cupertino_icons to v1 (#410)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [cupertino_icons](https://togithub.com/flutter/packages) |
dependencies | major | `^0.1.3` -> `^1.0.0` |

---

### Release Notes

<details>
<summary>flutter/packages</summary>

###
[`v1.0.5`](https://togithub.com/flutter/packages/blob/HEAD/third_party/packages/cupertino_icons/CHANGELOG.md#&#8203;105)

[Compare
Source](https://togithub.com/flutter/packages/compare/cupertino_icons-v1.0.4...cupertino_icons-v1.0.5)

-   Updates README to reference correct URL.

###
[`v1.0.4`](https://togithub.com/flutter/packages/blob/HEAD/third_party/packages/cupertino_icons/CHANGELOG.md#&#8203;104)

-   Updates README to link to API docs.

###
[`v1.0.3`](https://togithub.com/flutter/packages/blob/HEAD/third_party/packages/cupertino_icons/CHANGELOG.md#&#8203;103)

-   Source moved to flutter/packages.

###
[`v1.0.2`](https://togithub.com/flutter/packages/blob/HEAD/third_party/packages/cupertino_icons/CHANGELOG.md#&#8203;102)

-   Vertically center align the glyphs in the .ttf.

###
[`v1.0.1+1`](https://togithub.com/flutter/packages/blob/HEAD/third_party/packages/cupertino_icons/CHANGELOG.md#&#8203;1011)

- Add README note that version 1.0.0 should be used until nnbd is on
stable.

###
[`v1.0.1`](https://togithub.com/flutter/packages/blob/HEAD/third_party/packages/cupertino_icons/CHANGELOG.md#&#8203;1012)

-   Update README images

###
[`v1.0.0`](https://togithub.com/flutter/packages/blob/HEAD/third_party/packages/cupertino_icons/CHANGELOG.md#&#8203;100)

- Move to 1.0.0 and remove SDK version constraint since the font's
codepoints
    are now fully compatible and missing glyphs are backfilled.

</details>

---

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example/pubspec.yaml

@@ -19,7 +19,7 @@ dependencies:
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
-  cupertino_icons: ^0.1.3
+  cupertino_icons: ^1.0.0
 
 dev_dependencies:
   flutter_test: