Fix coveralls action

Author: tagliala

.github/workflows/ruby.yml

@@ -88,7 +88,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Coveralls Finished
-      uses: coverallsapp/github-action@master
+      uses: coverallsapp/github-action@v2
       with:
         github-token: ${{ secrets.github_token }}
         parallel-finished: true