Downgrade back to checkout@v2

Author: JamesMGreene

.github/workflows/release.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v2
       - name: Grep action.yaml content
         id: grep-image-content
         run: |