build(deps): bump coverlet.msbuild from 3.0.2 to 3.0.3 in /Sample (#344)

Bumps [coverlet.msbuild](https://github.com/coverlet-coverage/coverlet) from 3.0.2 to 3.0.3.
- [Release notes](https://github.com/coverlet-coverage/coverlet/releases)
- [Commits](https://github.com/coverlet-coverage/coverlet/commits)

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

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