Update dotnetcore-build.yml

Author: abbasc52

.github/workflows/dotnetcore-build.yml

@@ -37,5 +37,5 @@ jobs:
       uses: coverallsapp/github-action@1.1.3
       if: ${{ github.event_name == 'push' }}
       with:
-        github-token: ${{ secrets.COVERALLS_TOKEN }}
+        github-token: ${{ secrets.GITHUB_TOKEN }}
         path-to-lcov: ./coveragereport/lcov.info