The pinned SHA 27d5ce7f107fe9357f9df03efb73ab90386fccae corresponds to
actions/cache tag v5.0.5, not the floating v5 tag (which points to a
different commit). Update the comment to the truthful version so it
matches the pinned commit.
Resolves code-scanning alert #2553 (zizmor ref-version-mismatch).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>