Fix broken links (issue #1227) - #1237

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

No file matched to [/home/runner/work/fipguide.github.io/fipguide.github.io/**/*requirements*.txt,/home/runner/work/fipguide.github.io/fipguide.github.io/**/*requirements*.in,/home/runner/work/fipguide.github.io/fipguide.github.io/**/*constraints*.txt,/home/runner/work/fipguide.github.io/fipguide.github.io/**/*constraints*.in,/home/runner/work/fipguide.github.io/fipguide.github.io/**/pyproject.toml,/home/runner/work/fipguide.github.io/fipguide.github.io/**/uv.lock,/home/runner/work/fipguide.github.io/fipguide.github.io/**/*.py.lock]. The cache will never get invalidated. Make sure you have checked out the target repository and configured the cache-dependency-glob input correctly.