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.

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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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