ci: checkout

Author: Omochice

.github/workflows/ci.yml

@@ -97,6 +97,8 @@ jobs:
     if: startsWith(github.ref, 'refs/heads/main')
     needs: themis
     steps:
+      - name: checkout
+        uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
       - name: download artifacts
         uses: actions/download-artifact@65a9edc5881444af0b9093a5e628f2fe47ea3b2e # v4.1.7
         with: