Bump go_router from 11.1.4 to 12.0.0 in /testing_app (#2048)

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Bumps [go_router](https://github.com/flutter/packages/tree/main/packages) from 11.1.4 to 12.0.0.
<details>
<summary>Commits</summary>
<ul>
<li><a href="1a24dadf92"><code>1a24dad</code></a> [go_router] adds ability to dynamically update routing table. (<a href="https://github.com/flutter/packages/tree/main/packages/issues/5079">#5079</a>)</li>
<li><a href="47a14fd229"><code>47a14fd</code></a> [flutter_lints] rev flutter_lints to 3.0; increase dep on package:lints (<a href="https://github.com/flutter/packages/tree/main/packages/issues/5177">#5177</a>)</li>
<li><a href="d4390624a6"><code>d439062</code></a> [gis_web] Adds FedCM toggle. (<a href="https://github.com/flutter/packages/tree/main/packages/issues/5123">#5123</a>)</li>
<li><a href="e8127e76d5"><code>e8127e7</code></a> [quick_actions] Convert android to pigeon (<a href="https://github.com/flutter/packages/tree/main/packages/issues/5099">#5099</a>)</li>
<li><a href="b96a6dae0c"><code>b96a6da</code></a> [flutter_image] added example app (<a href="https://github.com/flutter/packages/tree/main/packages/issues/4353">#4353</a>)</li>
<li>See full diff in <a href="https://github.com/flutter/packages/commits/go_router-v12.0.0/packages">compare view</a></li>
</ul>
</details>
<br />

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</details>

testing_app/pubspec.yaml

@@ -12,7 +12,7 @@ dependencies:
 
   cupertino_icons: ^1.0.3
   provider: ^6.0.2
-  go_router: ">=10.0.0 <12.0.0"
+  go_router: ">=10.0.0 <13.0.0"
 
 dev_dependencies:
   analysis_defaults: