Bump codecov/codecov-action from 1 to 2.1.0 (#37)

* Bump codecov/codecov-action from 1 to 2.1.0

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 1 to 2.1.0.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/master/CHANGELOG.md)
- [Commits](codecov/codecov-action@v1...v2.1.0)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update cmake.yml

Thanks to @burgholzer for the help!

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Stefan Hillmich <hillmich@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/cmake.yml

@@ -91,12 +91,14 @@ jobs:
       - name: Configure CMake
         run: cmake -S "${{github.workspace}}" -B "${{github.workspace}}/build" -DCMAKE_BUILD_TYPE=Debug -DCOVERAGE=1 -DBUILD_DDSIM_TESTS=ON -DBINDINGS=ON
       - name: Build
-        run: cmake --build "${{github.workspace}}/build" --config Debug
+        run: cmake --build "${{github.workspace}}/build" --config Debug --target ddsim_test
       - name: Test
         working-directory: ${{github.workspace}}/build/test
         run: ctest -C Debug --output-on-failure
+      - name: Run gcov
+        run:  find . -type f -name '*.gcno' -exec gcov -p  {} +
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@v2.1.0
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           fail_ci_if_error: true