Merge pull request #345 from ruby-syntax-tree/dependabot/github_actions/actions/deploy-pages-2

Bump actions/deploy-pages from 1 to 2

Author: github-actions[bot]

.github/workflows/gh-pages.yml

@@ -51,4 +51,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v1
+        uses: actions/deploy-pages@v2