Upgrade actions in GH test workflow

Author: i-like-robots

.github/workflows/test.yml

@@ -43,6 +43,6 @@ jobs:
         run: npm run coverage
 
       - name: Send coverage report to Coveralls
-        uses: coverallsapp/github-action@master
+        uses: coverallsapp/github-action@v2
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}