build(deps-dev): bump @firebase/api-documenter from 0.3.0 to 0.4.0

Bumps [@firebase/api-documenter](https://github.com/firebase/firebase-js-sdk/tree/HEAD/repo-scripts/documenter) from 0.3.0 to 0.4.0.
- [Release notes](https://github.com/firebase/firebase-js-sdk/releases)
- [Commits](https://github.com/firebase/firebase-js-sdk/commits/@firebase/[email protected]/repo-scripts/documenter)

---
updated-dependencies:
- dependency-name: "@firebase/api-documenter"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -210,7 +210,7 @@
     "@google-cloud/storage": "^7.7.0"
   },
   "devDependencies": {
-    "@firebase/api-documenter": "^0.3.0",
+    "@firebase/api-documenter": "^0.4.0",
     "@firebase/app-compat": "^0.2.1",
     "@firebase/auth-compat": "^0.4.1",
     "@firebase/auth-types": "^0.12.0",