Bump com.google.firebase:firebase-admin from 9.1.1 to 9.4.0

Bumps [com.google.firebase:firebase-admin](https://github.com/firebase/firebase-admin-java) from 9.1.1 to 9.4.0.
- [Release notes](https://github.com/firebase/firebase-admin-java/releases)
- [Commits](firebase/firebase-admin-java@v9.1.1...v9.4.0)

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

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

Author: dependabot[bot]

build.gradle

@@ -83,7 +83,7 @@ dependencies {
     annotationProcessor "org.springframework:spring-context-indexer:$springVersion"
 
     // FCM Admin SDK
-    implementation 'com.google.firebase:firebase-admin:9.1.1'
+    implementation 'com.google.firebase:firebase-admin:9.4.0'
 
     // AOP
     runtimeOnly group: 'org.springframework', name: 'spring-aop', version: springVersion