Bump go_router from 7.1.1 to 8.0.1 in /testing_app (#1885)

Bumps
[go_router](https://github.com/flutter/packages/tree/main/packages) from
7.1.1 to 8.0.1.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="f6633b20d0"><code>f6633b2</code></a>
[go_router] Update link to example for query and path parameters (<a
href="https://github.com/flutter/packages/tree/main/packages/issues/3994">#3994</a>)</li>
<li><a
href="852acaa9f9"><code>852acaa</code></a>
[in_app_pur]: Bump org.jetbrains.kotlin:kotlin-bom from 1.8.0 to 1.8.21
in /p...</li>
<li><a
href="7d00ea7d4b"><code>7d00ea7</code></a>
[image_picker]: Bump androidx.activity:activity from 1.7.0 to 1.7.1 in
/packa...</li>
<li><a
href="bcddb9a1f0"><code>bcddb9a</code></a>
[webview_flutter] Explicitly disable ATS in example apps (<a
href="https://github.com/flutter/packages/tree/main/packages/issues/4166">#4166</a>)</li>
<li><a
href="3e0a170706"><code>3e0a170</code></a>
Fix stale ignore: prefer_const_constructors from flutter/packages (<a
href="https://github.com/flutter/packages/tree/main/packages/issues/4154">#4154</a>)</li>
<li><a
href="e13b8c4338"><code>e13b8c4</code></a>
[tool] Only run unit tests in Chrome for inline web (<a
href="https://github.com/flutter/packages/tree/main/packages/issues/4153">#4153</a>)</li>
<li><a
href="1057ab48db"><code>1057ab4</code></a>
[in_app_purchase] Make the _FeatureCard constructor const in the Android
exam...</li>
<li><a
href="d935cb0d2f"><code>d935cb0</code></a>
[shared_preferences] Fix initialization race (<a
href="https://github.com/flutter/packages/tree/main/packages/issues/4159">#4159</a>)</li>
<li><a
href="010ba50128"><code>010ba50</code></a>
[go_router] Refactors imperative APIs and browser history (<a
href="https://github.com/flutter/packages/tree/main/packages/issues/4134">#4134</a>)</li>
<li><a
href="e37dd83c91"><code>e37dd83</code></a>
[various] Add <code>http</code> 1.0 compatibility (<a
href="https://github.com/flutter/packages/tree/main/packages/issues/4147">#4147</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/flutter/packages/commits/go_router-v8.0.1/packages">compare
view</a></li>
</ul>
</details>
<br />


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testing_app/pubspec.yaml

@@ -12,7 +12,7 @@ dependencies:
 
   cupertino_icons: ^1.0.3
   provider: ^6.0.2
-  go_router: ^7.0.0
+  go_router: ">=7.0.0 <9.0.0"
 
 dev_dependencies:
   analysis_defaults: