Bump actions/setup-node from v2-beta to v2.1.4

Bumps [actions/setup-node](https://github.com/actions/setup-node) from v2-beta to v2.1.4.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v2-beta...c46424e)

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

.github/workflows/unit-tests.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-node@v2-beta
+      - uses: actions/setup-node@v2.1.4
         with:
           node-version: '10'
       - name: install yarn