ci: modernize Pages workflow (latest actions, pip cache, _site artifact)

Author: fjlopez

.github/workflows/ci.yml

@@ -27,24 +27,23 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Setup Pages
-        uses: actions/configure-pages@v2
+        uses: actions/configure-pages@v4
       - name: Setup Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
-          python-version: '3.11'
+          python-version-file: '.python-version'
+          cache: 'pip'
+          cache-dependency-path: 'requirements.txt'
       - name: Install MkDocs and other requirements
         run: pip install -r requirements.txt      
-      - name: Setup caching
-        uses: actions/cache@v3
-        with:
-          key: ${{ github.sha }}
-          path: .cache
       - name: Build site (_site directory name is used for Jekyll compatibility)
         run: mkdocs build --config-file ./mkdocs.yml --site-dir ./_site
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v1
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: ./_site
 
   # Deployment job
   deploy:
@@ -56,4 +55,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v1
+        uses: actions/deploy-pages@v4