Update workflow

Author: arjunkomath

.github/workflows/publish.yml

@@ -38,7 +38,7 @@ jobs:
       - name: Build
         run: rustyink build src
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v1
+        uses: actions/upload-pages-artifact@v2
         with:
           # Upload entire repository
           path: './_site'