Fixes #254 - Bump @vscode/test-electron to 3.1.0 and Node to 22 - #255

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, actions/setup-node@v4, GabrielBB/xvfb-action@f040be23a619e5ec34116f24098ad3626ceab681. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/