fix: use coverallsapp github action v2 instead of master

Author: henrybarreto

.github/workflows/linux.yml

@@ -129,7 +129,7 @@ jobs:
 
       - name: Coveralls upload
         if: matrix.name == 'nightly'
-        uses: coverallsapp/github-action@master
+        uses: coverallsapp/github-action@v2
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           path-to-lcov: target/coverage/lcov.info