chore(deps): bump firebase from 12.5.0 to 12.6.0 (#2037)

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/[email protected]@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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

frontend/package.json

@@ -65,7 +65,7 @@
     "@shoelace-style/shoelace": "^2.20.1",
     "@types/google.visualization": "^0.0.74",
     "@vaadin/router": "^2.0.0",
-    "firebase": "^12.5.0",
+    "firebase": "^12.6.0",
     "lit": "^3.3.1",
     "openapi-fetch": "^0.15.0"
   }