fix: Update deprecated GitHub Actions to latest versions

- Update actions/upload-artifact from v3 to v4
- Update actions/upload-pages-artifact from v3 to v4
- Resolves deprecation warnings in CI/CD workflows
- Ensures continued compatibility with GitHub Actions platform

Author: Dale Kunce

.github/workflows/deploy.yml

@@ -76,7 +76,7 @@ jobs:
         uses: actions/configure-pages@v4
 
       - name: Upload to GitHub Pages
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@v4
         with:
           path: _site/
 

.github/workflows/test-multilingual.yml

@@ -51,7 +51,7 @@ jobs:
         ./test-multilingual.sh
     
     - name: Upload build artifacts on failure
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       if: failure()
       with:
         name: build-artifacts