Use major version refs of GitHub Actions actions

Use of the major version ref will cause the workflow to use stable release versions of the utility actions while
automatically benefiting from ongoing development to those actions up until such time as a new major release of an action
is made. At that time we would need to evaluate whether any changes to the workflow are required by the breaking change
that triggered the major release before updating the major ref
(e.g., `uses: actions/checkout@v2` -> `uses: actions/checkout@v3`).

Author: per1234

.github/workflows/test-typescript-task.yml

@@ -17,10 +17,10 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@v2
 
       - name: Set Node.js 10.x
-        uses: actions/setup-node@master
+        uses: actions/setup-node@v2
         with:
           version: 10.x