fix: update Docker base images to resolve CI build failure - #206

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, gradle/actions/setup-gradle@af1da67850ed9a4cedd57bfd976089dd991e2582. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Failed to restore gradle-home-v1|Linux-X64|build-source-chk[f7f548ae8d176943c7f4667a703a144b]-a7ca1478d24f23bb2b782685c9c9e858c184a1b7: Error: Cache service responded with 400