Bump platform from 3.1.5 to 3.1.6 in /licenses (#3968)

Bumps [platform](https://github.com/dart-lang/core/tree/main/pkgs) from 3.1.5 to 3.1.6.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/dart-lang/core/releases">platform's releases</a>.</em></p>
<blockquote>
<h2>package:platform v3.1.6</h2>
<ul>
<li>Move to <code>dart-lang/core</code> monorepo.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a href="https://github.com/dart-lang/core/commits/platform-v3.1.6/pkgs">compare view</a></li>
</ul>
</details>
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</details>

licenses/pubspec.yaml

@@ -6,7 +6,7 @@ environment:
 
 dependencies:
   path: 1.9.0
-  platform: 3.1.5
+  platform: 3.1.6
 
 dev_dependencies:
   mockito: 5.4.4