Bump firebase from 8.6.1 to 8.6.2

Bumps [firebase](https://github.com/firebase/firebase-js-sdk) from 8.6.1 to 8.6.2.
- [Release notes](https://github.com/firebase/firebase-js-sdk/releases)
- [Changelog](https://github.com/firebase/firebase-js-sdk/blob/master/CHANGELOG.md)
- [Commits](https://github.com/firebase/firebase-js-sdk/compare/firebase@8.6.1...firebase@8.6.2)

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

package.json

@@ -12,7 +12,7 @@
     "codemirror": "^5.61.1",
     "cross-env": "^7.0.3",
     "crypto-js": "^4.0.0",
-    "firebase": "^8.6.1",
+    "firebase": "^8.6.2",
     "immutable": "^3.8.2",
     "node-sass": "^5.0.0",
     "react": "^16.14.0",