Update coverallsapp/github-action action to v2.3.1

Author: renovate[bot]

.github/workflows/main.yml

@@ -71,4 +71,4 @@ jobs:
         run: npm run coverage
 
       - name: Coveralls
-        uses: coverallsapp/github-action@v2.3.0
+        uses: coverallsapp/github-action@v2.3.1