Update Coveralls GitHub action

To get rid of a GitHub warning about using `set-output`.

Author: lawrence-forooghian

.github/workflows/check.yml

@@ -46,7 +46,7 @@ jobs:
           server-url: 'https://test-observability.herokuapp.com'
           server-auth: ${{ secrets.TEST_OBSERVABILITY_SERVER_AUTH_KEY }}
           path: 'junit/'
-      - uses: coverallsapp/github-action@1.1.3
+      - uses: coverallsapp/github-action@v2
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           flag-name: ruby-${{ matrix.ruby }}-${{ matrix.protocol }}-${{ matrix.type }}
@@ -56,7 +56,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Coveralls Finished
-        uses: coverallsapp/github-action@1.1.3
+        uses: coverallsapp/github-action@v2
         with:
           github-token: ${{ secrets.github_token }}
           parallel-finished: true