Fall back to MIT mirror for krb5 fetches in pyversions#298
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Two pyversions code paths still talked straight to kerberos.org with no fallback even after we wired up the MIT mirror in linux.py: - detect_krb5_versions() fetches the directory index to discover the latest 1.x release. A kerberos.org outage failed the whole auto-update workflow here (today's run logged four exponential retries before raising). - update_dependency_versions() then downloads the tarball to compute the SHA-256 the build will check against. That one is wrapped in a try/except so it degrades into "skip krb5 this run", but adding the same fallback gives us a successful update instead of a noop. Both now try kerberos.org first and fall through to web.mit.edu via small shared helpers.
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Two pyversions code paths still talked straight to kerberos.org with no fallback even after we wired up the MIT mirror in linux.py:
Both now try kerberos.org first and fall through to web.mit.edu via small shared helpers.