Bump codecov/codecov-action from 5 to 6 (UniversalRobots#1736)

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 5 to 6.
- [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...v6)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Author: dependabot[bot]

.github/workflows/coverage-build.yml

@@ -40,7 +40,7 @@ jobs:
             }
           colcon-mixin-repository: https://raw.githubusercontent.com/colcon/colcon-mixin-repository/master/index.yaml
           skip-tests: false
-      - uses: codecov/codecov-action@v5
+      - uses: codecov/codecov-action@v6
         with:
           fail_ci_if_error: true
           file: ros_ws/lcov/total_coverage.info