Bump maven.version from 3.6.3 to 3.8.1

Bumps `maven.version` from 3.6.3 to 3.8.1.

Updates `maven-plugin-api` from 3.6.3 to 3.8.1
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](https://github.com/apache/maven/compare/maven-3.6.3...maven-3.8.1)

Updates `maven-core` from 3.6.3 to 3.8.1
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](https://github.com/apache/maven/compare/maven-3.6.3...maven-3.8.1)

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