Bump go_router from 14.8.1 to 15.0.0 in /animations (#2616)

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="b03228fba3"><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="2fcc4032dd"><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="43890676d0"><code>4389067</code></a>
[webview_flutter_android] Adds internal wrapper methods for native
`WebViewCl...</li>
<li><a
href="7bdffbe33f"><code>7bdffbe</code></a>
[webview_flutter_wkwebview] Fixes <code>loadFlutterAsset</code>
exception and updates na...</li>
<li><a
href="f26b681ab4"><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="312f23f9bf"><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="2405f6a2b7"><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="4a36dc63f7"><code>4a36dc6</code></a>
[all_packages] Enforce property assignment for compile sdk over method
assign...</li>
<li><a
href="eaf475cefb"><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="07496eb030"><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>
<br />


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animations/pubspec.yaml

@@ -10,7 +10,7 @@ dependencies:
   flutter:
     sdk: flutter
   flutter_animate: ^4.1.0
-  go_router: ^14.0.0
+  go_router: ^15.0.0
   window_size: # plugin is not yet part of the flutter framework
     git:
       url: https://github.com/google/flutter-desktop-embedding.git