deps: Update to AGP v9.3.1

[david-livefront]

🎟️ Tracking

N/A

📔 Objective

This PR updates the app to use the latest version of AGP (v9.3.1).

Release Notes!

[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

This PR bumps the Android Gradle Plugin from 9.2.1 to 9.3.1 in gradle/libs.versions.toml and regenerates buildscript-gradle.lockfile to match. The lock file changes are consistent with the manifest bump: all com.android.* classpath artifacts move to 9.3.1/32.3.1, with transitive bumps to Guava (33.3.1 → 33.4.0) and Error Prone annotations (2.28.0 → 2.36.0). No stale 9.2.1 references remain anywhere in the build configuration, the other two lock files (gradle.lockfile, settings-gradle.lockfile) contain no AGP artifacts and correctly need no changes, and the Gradle wrapper (9.6.1) already satisfies AGP 9.3's minimum. No findings.

Code Review Details

No findings.

Dependency Changes

Package	Change	Ecosystem
com.android.tools.build:gradle (AGP)	9.2.1 → 9.3.1	Gradle
com.android.tools:* (build tools)	32.2.1 → 32.3.1	Gradle
com.google.guava:guava	33.3.1-jre → 33.4.0-jre	Gradle
com.google.errorprone:error_prone_annotations	2.28.0 → 2.36.0	Gradle

All are existing, previously approved dependencies; the Guava and Error Prone bumps are transitive to the AGP upgrade and buildscript-classpath only.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.71%. Comparing base (38d79cb) to head (7400d5c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7246      +/-   ##
==========================================
- Coverage   86.25%   85.71%   -0.55%     
==========================================
  Files         891     1054     +163     
  Lines       65294    68192    +2898     
  Branches     9808     9915     +107     
==========================================
+ Hits        56320    58450    +2130     
- Misses       5472     6207     +735     
- Partials     3502     3535      +33     

Flag	Coverage Δ
app-data	18.02% <ø> (+0.14%)	⬆️
app-ui-auth-tools	19.06% <ø> (+0.29%)	⬆️
app-ui-platform	16.96% <ø> (+0.54%)	⬆️
app-ui-vault	27.88% <ø> (+0.55%)	⬆️
authenticator	6.09% <ø> (ø)
lib-core-network-bridge	4.12% <ø> (+0.02%)	⬆️
lib-data-ui	1.20% <ø> (+<0.01%)	⬆️

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[david-livefront]

Thanks @aj-rosado