because v2 cache is deprecated Update update-theme.yml

Author: SQLDBAWithABeard

.github/workflows/update-theme.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           token: ${{ secrets.REPO_TOKEN }}