chore(deps): bump gradle/actions from 4 to 6 - #8

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Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-java@v4, android-actions/setup-android@v3. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

setup-java v4 is deprecated and will no longer receive updates. Please migrate to actions/setup-java@v5.

Gradle 8.11.1 is out of date: consider updating to the latest Gradle version. See https://docs.gradle.org/current/userguide/feature_lifecycle.html#eol_support