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Merge pull request #21838 from github/copilot/widen-regex-for-pinned-actions

Align `alphaNumericRegex()` with the documented grouped SHA pattern
O
Owen Mansel-Chan committed
ad69cfb721fba9e40817d6534c5ff2a7cdc40dda
Committed by GitHub <noreply@github.com> on 5/18/2026, 4:35:27 PM