Bump firebase from 12.5.0 to 12.6.0

Bumps [firebase](https://github.com/firebase/firebase-js-sdk) from 12.5.0 to 12.6.0.
- [Release notes](https://github.com/firebase/firebase-js-sdk/releases)
- [Changelog](https://github.com/firebase/firebase-js-sdk/blob/main/CHANGELOG.md)
- [Commits](https://github.com/firebase/firebase-js-sdk/compare/firebase@12.5.0...firebase@12.6.0)

---
updated-dependencies:
- dependency-name: firebase
  dependency-version: 12.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -20,7 +20,7 @@
     "@discordjs/voice": "^0.19.0",
     "@discordjs/opus": "^0.10.0",
     "dotenv": "^17.2.3",
-    "firebase": "^12.5.0",
+    "firebase": "^12.6.0",
     "firebase-admin": "^13.6.0",
     "he": "^1.2.0",
     "ms": "^2.1.3",