feat: Add bazel-diff server improvements - #623

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache/restore@v4, actions/checkout@v4, actions/setup-go@v5, actions/setup-java@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Restore cache failed: Dependencies file is not found in /home/runner/work/bazel-diff/bazel-diff. Supported file pattern: go.sum

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