Bump com.google.android.gms:play-services-auth from 21.5.1 to 21.6.0

Bumps com.google.android.gms:play-services-auth from 21.5.1 to 21.6.0.

---
updated-dependencies:
- dependency-name: com.google.android.gms:play-services-auth
  dependency-version: 21.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

FlowCrypt/build.gradle.kts

@@ -512,7 +512,7 @@ dependencies {
   implementation("androidx.webkit:webkit:1.16.0")
 
   implementation("com.google.android.gms:play-services-base:18.10.0")
-  implementation("com.google.android.gms:play-services-auth:21.5.1")
+  implementation("com.google.android.gms:play-services-auth:21.6.0")
   implementation("com.google.android.material:material:1.14.0")
   implementation("com.google.android.flexbox:flexbox:3.0.0")
   implementation("com.google.code.gson:gson:2.14.0")