v1.0.1 — SHA-pin actions/cache

Patch release. Single behavior-preserving change for supply-chain hygiene.

Change

• action.yml: actions/cache@v5 → actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5.0.5

Matches the SHA-pinning style sibling consumers use for their own
actions/cache references. Closes the supply-chain regression
introduced when the migration replaced their pinned actions/cache
with the floating @v5 reference.

No semantic change — v5.0.5 is the current v5 patch.

Upgrade

If you're on @v1, you're already on v1.0.1.

If you're SHA-pinned to v1.0.0 (@6bb3a2b...), bump to v1.0.1's SHA
or to @v1.0.1.