Bump maven-compiler-plugin from 3.5.1 to 3.8.1

Bumps [maven-compiler-plugin](https://github.com/apache/maven-compiler-plugin) from 3.5.1 to 3.8.1.
- [Release notes](https://github.com/apache/maven-compiler-plugin/releases)
- [Commits](https://github.com/apache/maven-compiler-plugin/compare/maven-compiler-plugin-3.5.1...maven-compiler-plugin-3.8.1)

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