Bump firebase-database from 19.7.0 to 20.0.2 in /android

Bumps firebase-database from 19.7.0 to 20.0.2.

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

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

Author: dependabot[bot]

android/app/build.gradle

@@ -40,7 +40,7 @@ dependencies {
     implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
     implementation 'androidx.legacy:legacy-support-v4:1.0.0'
     implementation 'com.google.firebase:firebase-auth:20.0.4'
-    implementation 'com.google.firebase:firebase-database:19.7.0'
+    implementation 'com.google.firebase:firebase-database:20.0.2'
     testImplementation 'junit:junit:4.+'
     androidTestImplementation 'androidx.test.ext:junit:1.1.2'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'