fix(ci): pin action to release hash

Author: oleonardolima

.github/workflows/cron-update-rust.yml

@@ -20,7 +20,7 @@ jobs:
         with:
           app-id: ${{ secrets.APP_ID }}
           private-key: ${{ secrets.APP_PRIVATE_KEY }}
-      - uses: crazy-max/ghaction-import-gpg@v7
+      - uses: crazy-max/ghaction-import-gpg@2dc316deee8e90f13e1a351ab510b4d5bc0c82cd # v7.0.0
         with:
           gpg_private_key: ${{ secrets.GPG_PRIVATE_KEY }}
           git_user_signingkey: true