Bump go_router from 8.2.0 to 9.0.0 in /form_app (#1916)

Bumps
[go_router](https://github.com/flutter/packages/tree/main/packages) from
8.2.0 to 9.0.0.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="6b70804799"><code>6b70804</code></a>
[go_router] Reduces excessive rebuilds due to inherited look up. (<a
href="https://github.com/flutter/packages/tree/main/packages/issues/4227">#4227</a>)</li>
<li><a
href="f55d455f0d"><code>f55d455</code></a>
[image_picker] Update to 1.0 (<a
href="https://github.com/flutter/packages/tree/main/packages/issues/4285">#4285</a>)</li>
<li><a
href="25e1d87113"><code>25e1d87</code></a>
[file_selector] Add file group to save return value (<a
href="https://github.com/flutter/packages/tree/main/packages/issues/4222">#4222</a>)</li>
<li>See full diff in <a
href="https://github.com/flutter/packages/commits/go_router-v9.0.0/packages">compare
view</a></li>
</ul>
</details>
<br />


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form_app/pubspec.yaml

@@ -18,7 +18,7 @@ dependencies:
     git:
       url: https://github.com/google/flutter-desktop-embedding.git
       path: plugins/window_size
-  go_router: ^8.0.0
+  go_router: ^9.0.0
 
 dev_dependencies:
   analysis_defaults: