Bump org.apache.maven:maven-core in /arthur-maven-plugin

Bumps [org.apache.maven:maven-core](https://github.com/apache/maven) 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)

---
updated-dependencies:
- dependency-name: org.apache.maven:maven-core
  dependency-type: direct:production
...

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