fix directory ownership

Author: casibbald

.github/workflows/jekyll-gh-pages.yml

@@ -28,7 +28,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Set ownership
         run: |
             # this is to fix GIT not liking owner of the checkout dir