Only pin major version of actions/setup-node action used in CI workflow

This allows the CI system to benefit from ongoing improvements to the actions/setup-node GitHub Actions action, while
avoiding breaking changes.

Author: per1234

.github/workflows/test.yml

@@ -22,7 +22,7 @@ jobs:
         uses: actions/checkout@master
 
       - name: Set Node.js 10.x
-        uses: actions/setup-node@v1.4.4
+        uses: actions/setup-node@v1
         with:
           node-version: 10.x