Bump submodules/kotlin-plugin from 28718ef to d06588c

Bumps [submodules/kotlin-plugin](https://github.com/SonarSource/sonar-kotlin) from `28718ef` to `d06588c`.
- [Release notes](https://github.com/SonarSource/sonar-kotlin/releases)
- [Commits](SonarSource/sonar-kotlin@28718ef...d06588c)

---
updated-dependencies:
- dependency-name: submodules/kotlin-plugin
  dependency-type: direct:production
...

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