Bump firebase_core from 4.2.1 to 4.3.0 in /dashboard (#4902)

Bumps [firebase_core](https://github.com/firebase/flutterfire/tree/main/packages/firebase_core) from 4.2.1 to 4.3.0.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/firebase/flutterfire/commit/39bdb5b1ef392e8c31c60209e333b45e408099e8"><code>39bdb5b</code></a> chore(release): publish packages</li>
<li><a href="https://github.com/firebase/flutterfire/commit/44d99a94f00eb34a175a36ee35c074afcadf9890"><code>44d99a9</code></a> refactor(firebase_core, web): remove variant fallback in registerVersion (<a href="https://github.com/firebase/flutterfire/tree/main/packages/firebase_core/issues/17">#17</a>...</li>
<li><a href="https://github.com/firebase/flutterfire/commit/668331b446726daef719a68b43b34af7b1ae411f"><code>668331b</code></a> feat: bump Firebase iOS SDK to 12.6.0 (<a href="https://github.com/firebase/flutterfire/tree/main/packages/firebase_core/issues/17857">#17857</a>)</li>
<li><a href="https://github.com/firebase/flutterfire/commit/2f619a316655e1b1d625abcfd4b8f32120ba093e"><code>2f619a3</code></a> chore(release): publish packages (<a href="https://github.com/firebase/flutterfire/tree/main/packages/firebase_core/issues/17841">#17841</a>)</li>
<li>See full diff in <a href="https://github.com/firebase/flutterfire/commits/firebase_core-v4.3.0/packages/firebase_core">compare view</a></li>
</ul>
</details>
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Author: dependabot[bot]

dashboard/pubspec.yaml

@@ -17,7 +17,7 @@ dependencies:
     path: ../packages/cocoon_common
   collection: any # Match Flutter SDK
   firebase_auth: ^6.0.0
-  firebase_core: 4.2.1 # Rolled by dependabot
+  firebase_core: 4.3.0 # Rolled by dependabot
   firebase_crashlytics: 5.0.5 # Rolled by dependabot
   flutter:
     sdk: flutter