Bump actions/setup-node from v1 to v2.1.1 (#275)

Bumps [actions/setup-node](https://github.com/actions/setup-node) from v1 to v2.1.1.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v1...321b6cc)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: worldtiki <[email protected]>

Author: dependabot[bot]

.github/workflows/gh-pages.yml

@@ -17,7 +17,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Use Node.js 12
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v2.1.1
         with:
           node-version: 12