Bump com.google.firebase:firebase-admin from 9.3.0 to 9.4.2

Bumps [com.google.firebase:firebase-admin](https://github.com/firebase/firebase-admin-java) from 9.3.0 to 9.4.2.
- [Release notes](https://github.com/firebase/firebase-admin-java/releases)
- [Commits](firebase/firebase-admin-java@v9.3.0...v9.4.2)

---
updated-dependencies:
- dependency-name: com.google.firebase:firebase-admin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -77,7 +77,7 @@
         <!-- Library Versions -->
         <pushy.version>0.15.4</pushy.version>
         <google-api-client.version>2.7.0</google-api-client.version>
-        <firebase-admin.version>9.3.0</firebase-admin.version>
+        <firebase-admin.version>9.4.2</firebase-admin.version>
         <logstash.version>8.0</logstash.version>
 
         <!-- Documentation Dependencies -->