Upgrade to actions/upload-pages-artifact@v3.0.1

Author: overfullstack

.github/workflows/gatsby.yml

@@ -60,8 +60,8 @@ jobs:
         env:
           GATSBY_CPU_COUNT: 1
         run: yarn build
-      - name: Upload artifact
-        uses: actions/upload-pages-artifact@v2
+      - name: Upload GitHub Pages artifact
+        uses: actions/upload-pages-artifact@v3.0.1
         with:
           path: ./public