Merge pull request #349 from ruby/dependabot/github_actions/actions/upload-pages-artifact-3

Author: kateinoigakukun

.github/workflows/docs.yml

@@ -32,7 +32,7 @@ jobs:
       - name: Build HTML by RDoc
         run: rake rdoc
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v2
+        uses: actions/upload-pages-artifact@v3
         with:
           path: ./html