Bump actions/setup-node from v1 to v2.1.2 (#146)

Bumps [actions/setup-node](https://github.com/actions/setup-node) from v1 to v2.1.2.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](https://github.com/actions/setup-node/compare/v1...c6fd00ceb9747fb23ffdf72987450a2664414867)

Signed-off-by: dependabot[bot] <support@github.com>

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

.github/workflows/autoprefixer.yml

@@ -11,7 +11,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Setup Node
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v2.1.2
         with:
           node-version: "12.x"