chore(deps): bump org.junit:junit-bom from 5.10.0 to 6.1.2 in /sdk/java - #1324

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