Bump firebase-messaging from 23.0.5 to 23.0.6

Bumps firebase-messaging from 23.0.5 to 23.0.6.

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

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

app/build.gradle

@@ -334,7 +334,7 @@ dependencies {
     spotbugsPlugins 'com.mebigfatguy.fb-contrib:fb-contrib:7.4.7'
 
     gplayImplementation 'com.google.android.gms:play-services-base:18.1.0'
-    gplayImplementation "com.google.firebase:firebase-messaging:23.0.5"
+    gplayImplementation "com.google.firebase:firebase-messaging:23.0.6"
 
     // implementation 'androidx.activity:activity-ktx:1.4.0'
 }