Bump com.google.android.gms:play-services-auth from 20.2.0 to 21.1.1

Bumps com.google.android.gms:play-services-auth from 20.2.0 to 21.1.1.

---
updated-dependencies:
- dependency-name: com.google.android.gms:play-services-auth
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

WooCommerce/build.gradle

@@ -214,7 +214,7 @@ dependencies {
     implementation 'com.google.firebase:firebase-config'
     implementation 'com.google.firebase:firebase-analytics'
 
-    implementation 'com.google.android.gms:play-services-auth:20.2.0'
+    implementation 'com.google.android.gms:play-services-auth:21.1.1'
 
     // Support library
     implementation "androidx.core:core-ktx:$coreKtxVersion"