docs(#563): add Go concurrent fan-out error handling guidance - #571

No file matched to [/home/runner/work/fullsend/fullsend/**/*requirements*.txt,/home/runner/work/fullsend/fullsend/**/*requirements*.in,/home/runner/work/fullsend/fullsend/**/*constraints*.txt,/home/runner/work/fullsend/fullsend/**/*constraints*.in,/home/runner/work/fullsend/fullsend/**/pyproject.toml,/home/runner/work/fullsend/fullsend/**/uv.lock,/home/runner/work/fullsend/fullsend/**/*.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.