Bump com.google.firebase:firebase-crashlytics from 18.6.3 to 18.6.4

Bumps [com.google.firebase:firebase-crashlytics](https://github.com/firebase/firebase-android-sdk) from 18.6.3 to 18.6.4.
- [Changelog](https://github.com/firebase/firebase-android-sdk/blob/master/docs/make_release_notes.py)
- [Commits](https://github.com/firebase/firebase-android-sdk/commits)

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

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

app/build.gradle

@@ -205,7 +205,7 @@ dependencies {
     // Dependencies for the Play Store version.
     storeImplementation 'com.google.android.gms:play-services-maps:18.2.0'
     storeImplementation 'com.google.firebase:firebase-analytics:21.5.0'
-    storeImplementation 'com.google.firebase:firebase-crashlytics:18.6.3'
+    storeImplementation 'com.google.firebase:firebase-crashlytics:18.6.4'
     storeImplementation 'com.google.android.gms:play-services-code-scanner:16.1.0'
 
     // Dependencies for open version.