Bump version to 2.31.0-beta.6

- Update Android versionName for the beta.6 release
- Keep the release bump scoped to Gradle app metadata

🤖 Auto-generated

Author: OwenMcGirr

app/build.gradle.kts

@@ -20,7 +20,7 @@ android {
         minSdk = 29
         targetSdk = 36
         versionCode = gitVersionCode()
-        versionName = "2.31.0-beta.5"
+        versionName = "2.31.0-beta.6"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables {