generate_sbom.py downloads sources to verify their hashes. Sometimes these downloads flake, like inhttps://github.com/python/cpython/actions/runs/15118338626/job/42494602073?pr=134253

I've made a PR to add retries with exponential backoff:

Linked PRs

• gh-134262: Add retries to generate_sbom.py #134263
• [3.14] gh-134262: Add retries to generate_sbom.py (GH-134263) #134460
• gh-134262: increase retries inTools/build/generate_sbom.py #134558