Bump firebase_core from 4.2.0 to 4.2.1 in /dashboard (#4874)

Bumps [firebase_core](https://github.com/firebase/flutterfire/tree/main/packages/firebase_core) from 4.2.0 to 4.2.1.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/firebase/flutterfire/commit/1fc2adfbeb6e132e49ba72d04c727227f9827b3e"><code>1fc2adf</code></a> chore(release): publish packages</li>
<li><a href="https://github.com/firebase/flutterfire/commit/795567a64f20c7982e171d4dd66bd7ec61a7035b"><code>795567a</code></a> fix(core, web): More explicit interop types (<a href="https://github.com/firebase/flutterfire/tree/main/packages/firebase_core/issues/17809">#17809</a>)</li>
<li><a href="https://github.com/firebase/flutterfire/commit/3c8c83d4251f2965ae6fb1fe7b64c21dcb94e9ec"><code>3c8c83d</code></a> feat(web): add <code>registerVersion</code> support for packages (<a href="https://github.com/firebase/flutterfire/tree/main/packages/firebase_core/issues/17780">#17780</a>)</li>
<li><a href="https://github.com/firebase/flutterfire/commit/455a068773239ec9a6d42cfe52b10ee973bbfedb"><code>455a068</code></a> chore(release): publish packages (<a href="https://github.com/firebase/flutterfire/tree/main/packages/firebase_core/issues/17787">#17787</a>)</li>
<li>See full diff in <a href="https://github.com/firebase/flutterfire/commits/firebase_core-v4.2.1/packages/firebase_core">compare view</a></li>
</ul>
</details>
<br />

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Author: dependabot[bot]

dashboard/pubspec.yaml

@@ -15,7 +15,7 @@ dependencies:
     path: ../packages/cocoon_common
   collection: any # Match Flutter SDK
   firebase_auth: ^6.0.0
-  firebase_core: 4.2.0 # Rolled by dependabot
+  firebase_core: 4.2.1 # Rolled by dependabot
   firebase_crashlytics: 5.0.3 # Rolled by dependabot
   flutter:
     sdk: flutter