chore: bump com.android.tools.build:gradle from 8.1.4 to 9.3.1 in /android

[dependabot]

Bumps com.android.tools.build:gradle from 8.1.4 to 9.3.1.

You can trigger a rebase of this PR by commenting @dependabot rebase.

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[cursor]

PR Summary

Medium Risk
Major AGP upgrades can break Android builds or require Gradle/JDK updates; only the plugin version changes here, so runtime app code risk is low but build-tooling risk is meaningful.

Overview
Bumps the Android Gradle Plugin (AGP) on the android module from 8.1.4 to 9.3.1 via the com.android.tools.build:gradle buildscript classpath in android/build.gradle.

This is a major AGP upgrade (8.x → 9.x) with no other build file changes in the diff. Integrators and CI may need a compatible Gradle wrapper/JDK if builds fail after merging; the repo wrapper is still Gradle 8.5, which may need a separate bump for full AGP 9 compatibility.

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[nickolas-dimitrakas]

Superseded by #393 — this bump alone can't pass CI (needs the Gradle wrapper bump + kotlin-android guard too), so it's combined there.

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.