Add missing v prefix to action pin version comments

Resolves zizmor ref-version-mismatch warnings on hash-pinned actions whose
version comments omitted the leading v (the pinned commits already match the
corresponding vX.Y.Z tags). Comment-only change.

Part of STF-557.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: oschwald

.github/workflows/release.yml

@@ -35,4 +35,4 @@ jobs:
 
       # zizmor complains that 'v1' is a ref that can be provided by both the branch and tag namespaces.
       # specify that we want the v1 branch.
-      - uses: rubygems/release-gem@6317d8d1f7e28c24d28f6eff169ea854948bd9f7 # 1.2.0
+      - uses: rubygems/release-gem@6317d8d1f7e28c24d28f6eff169ea854948bd9f7 # v1.2.0