Bump com.google.firebase:firebase-core from 16.0.6 to 21.1.1

Bumps com.google.firebase:firebase-core from 16.0.6 to 21.1.1.

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

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

app/build.gradle

@@ -39,7 +39,7 @@ dependencies {
     implementation 'androidx.legacy:legacy-support-v4:1.0.0'
     implementation 'com.google.android.material:material:1.0.0'
     //Firebase
-    implementation 'com.google.firebase:firebase-core:16.0.6'
+    implementation 'com.google.firebase:firebase-core:21.1.1'
     implementation 'com.google.firebase:firebase-crash:16.2.1'
 }