Upgrade upload-pages-artifact

Author: cschleiden

.github/workflows/docs.yml

@@ -38,7 +38,7 @@ jobs:
       - name: Setup Pages
         uses: actions/configure-pages@v3
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v2
+        uses: actions/upload-pages-artifact@v3
         with:
           # Upload entire repository
           path: './docs/build/'