Fix GitHub Actions workflow - update to latest action versions

- Updated actions/configure-pages to v4
- Updated actions/upload-pages-artifact to v3
- Updated actions/deploy-pages to v4
- Fixes deprecated artifact action warnings

Author: krishnasaga

.github/workflows/deploy-docs.yml

@@ -40,10 +40,10 @@ jobs:
       run: mkdocs build --clean --strict
 
     - name: Setup Pages
-      uses: actions/configure-pages@v3
+      uses: actions/configure-pages@v4
 
     - name: Upload artifact
-      uses: actions/upload-pages-artifact@v2
+      uses: actions/upload-pages-artifact@v3
       with:
         path: './site'
 
@@ -57,4 +57,4 @@ jobs:
     steps:
     - name: Deploy to GitHub Pages
       id: deployment
-      uses: actions/deploy-pages@v2
+      uses: actions/deploy-pages@v4