fix: update verify GPG signature step

.github/workflows/commit-verifier.yaml

@@ -43,6 +43,4 @@ jobs:
       - name: Verify GPG Signature
         run: |
           LAST_COMMIT=$(git rev-parse HEAD)
-          SIGNATURE=$(git log --show-signature -1 $LAST_COMMIT)
-          echo "$SIGNATURE" | grep 'gpg: Signature made'
-          echo "$SIGNATURE" | grep 'gpg: Good signature'
+          git verify-commit $LAST_COMMIT