Bump go_router from 14.8.1 to 15.0.0 in /testing_app (#2611)

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Bumps [go_router](https://github.com/flutter/packages/tree/main/packages) from 14.8.1 to 15.0.0.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/flutter/packages/commit/b03228fba3f4154928e2ab379a67fdb7fb0e3f5e"><code>b03228f</code></a> [go_router] Adds <code>caseSensitive</code> to <code>GoRoute</code> (<a href="https://github.com/flutter/packages/tree/main/packages/issues/8992">#8992</a>)</li>
<li><a href="https://github.com/flutter/packages/commit/2fcc4032dd8b1a3da0b4424d49341bedd86d5137"><code>2fcc403</code></a> [camera_android_camerax] Updates internal API wrapper to use ProxyApis (<a href="https://github.com/flutter/packages/tree/main/packages/issues/8618">#8618</a>)</li>
<li><a href="https://github.com/flutter/packages/commit/43890676d0244d4b01a0c67013a754891377e362"><code>4389067</code></a> [webview_flutter_android] Adds internal wrapper methods for native `WebViewCl...</li>
<li><a href="https://github.com/flutter/packages/commit/7bdffbe33ff500698cc07de879eab5d1a9f9c761"><code>7bdffbe</code></a> [webview_flutter_wkwebview] Fixes <code>loadFlutterAsset</code> exception and updates na...</li>
<li><a href="https://github.com/flutter/packages/commit/f26b681ab40dcd51c7a2156e60936468d9bfea60"><code>f26b681</code></a> [various] Update Android example toolchains (<a href="https://github.com/flutter/packages/tree/main/packages/issues/9062">#9062</a>)</li>
<li><a href="https://github.com/flutter/packages/commit/312f23f9bf368ff1776896bfdb88772b963cc936"><code>312f23f</code></a> [shared_preferences] Allow reading int as long in SharedPreferences <a href="https://github.com/flutter/packages/tree/main/packages/issues/165781">#165781</a> (...</li>
<li><a href="https://github.com/flutter/packages/commit/2405f6a2b7e1664e2779030c6b651676ecbe7651"><code>2405f6a</code></a> [pigeon] swift equality methods (<a href="https://github.com/flutter/packages/tree/main/packages/issues/8971">#8971</a>)</li>
<li><a href="https://github.com/flutter/packages/commit/4a36dc63f7197f5cf4f0d0b9b670492b8848c502"><code>4a36dc6</code></a> [all_packages] Enforce property assignment for compile sdk over method assign...</li>
<li><a href="https://github.com/flutter/packages/commit/eaf475cefb53d99f1439cbaddf7146de0fb0d571"><code>eaf475c</code></a> [google_maps_flutter] Fix iOS info window regression (<a href="https://github.com/flutter/packages/tree/main/packages/issues/8939">#8939</a>)</li>
<li><a href="https://github.com/flutter/packages/commit/07496eb03035440c7f0ba7089a49826248c8daeb"><code>07496eb</code></a> [multicast_dns] MDnsClient::listen supports onError callback (<a href="https://github.com/flutter/packages/tree/main/packages/issues/8888">#8888</a>)</li>
<li>Additional commits viewable in <a href="https://github.com/flutter/packages/commits/go_router-v15.0.0/packages">compare view</a></li>
</ul>
</details>
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Author: dependabot[bot]

testing_app/pubspec.yaml

@@ -12,7 +12,7 @@ dependencies:
 
   cupertino_icons: ^1.0.3
   provider: ^6.0.2
-  go_router: ">=10.0.0 <15.0.0"
+  go_router: ">=10.0.0 <16.0.0"
 
 dev_dependencies:
   analysis_defaults: