chore(deps): update actions/upload-pages-artifact action to v4

Author: renovate[bot]

.github/workflows/deploy-docs.yml

@@ -48,7 +48,7 @@ jobs:
       - name: Build with VitePress
         run: VITE_BASE_URL=/leaflet/ npm run docs:build
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@v4
         with:
           path: docs/.vitepress/dist