chore: bump com.android.tools.build:gradle from 8.1.4 to 9.2.1

[dependabot]

Bumps com.android.tools.build:gradle from 8.1.4 to 9.2.1.

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[cursor]

PR Summary

Medium Risk
Major AGP version jump can break builds or require Gradle/JDK upgrades across all Android modules until CI passes.

Overview
Bumps the Android Gradle Plugin (com.android.tools.build:gradle) from 8.1.4 to 9.2.1 by updating ext.gradle_version in the root build.gradle. No other build files or module configs change in this diff.

This is a major AGP upgrade, so local and CI builds may need a compatible Gradle wrapper/JDK and could surface new plugin warnings or breaking behavior until the toolchain is aligned.

^{Reviewed by Cursor Bugbot for commit 5e3f723. Bugbot is set up for automated code reviews on this repo. Configure here.}

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud