Merge pull request #10 from cybozu/bump-upload-pages-artifact-to-v4

bump actions/upload-pages-artifact version

Author: elmetal

.github/workflows/deploy_docc.yml

@@ -35,7 +35,7 @@ jobs:
             --output-path ./docs
 
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@v4
         with:
           path: docs