Bump actions/setup-node from v1 to v2.1.2 (#54)

Bumped actions/setup-node [1] from v1 to v2.1.2 [2].
This comes with speed and performance improvements by using a dedicated,
built-in image cache for Node.js distributions.

[1]: https://github.com/actions/setup-node
[2]: actions/setup-node@v1...c6fd00c

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

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v2
       - name: "Setup Node.js version 14.x"
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v2.1.2
         with:
           node-version: "14.x"
       - name: Install Node modules