updated actions to v5

Author: markdlp

.github/workflows/gh-pages.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4 # Updated to v4
+        uses: actions/checkout@v5 # Updated to v5
         with:
           submodules: recursive # 'recursive' is safer for themes
           fetch-depth: 0