Bump codecov/codecov-action from 1.2.1 to 2.1.0 (#138)

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 1.2.1 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@v1.2.1...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] <[email protected]>

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

Author: dependabot[bot]

.github/workflows/test.yml

@@ -69,7 +69,7 @@ jobs:
         run: dotnet test --no-restore -p:CollectCoverage=true
       - name: Upload coverage to codecov
         if: ${{ startsWith(matrix.os, 'ubuntu') }}
-        uses: codecov/codecov-action@v1.2.1
+        uses: codecov/codecov-action@v2.1.0
         with:
           files: .coverage/GraphQLParser.Tests/coverage.net5.opencover.xml