Pin actions (#122)

Author: offa

.github/workflows/mirror.yml

@@ -265,7 +265,7 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@main
-      - uses: wearerequired/git-mirror-action@master
+      - uses: wearerequired/git-mirror-action@c44c68aebe42de49a80a8dfd557416b6a0cafdad
         env:
           SSH_PRIVATE_KEY: ${{ secrets[format('SSH_PRIVATE_KEY_{0}', matrix.mirror_config.key_id)] }}
           SSH_KNOWN_HOSTS: "${{ secrets.SSH_KNOWN_HOSTS }}"