build(deps): bump codecov/codecov-action from 5.1.1 to 5.1.2

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 5.1.1 to 5.1.2.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v5.1.1...v5.1.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/run_all_tests_and_upload_code_coverage.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Run tests
         run: dotnet test csharp/PhoneNumbers.sln --configuration Release --verbosity normal --collect:"XPlat Code Coverage" --results-directory ./coverage
       - name: Upload coverage reports to Codecov
-        uses: codecov/[email protected].1
+        uses: codecov/[email protected].2
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           slug: twcclegg/libphonenumber-csharp