Bump org.apache.maven:maven-core (#226)

Bumps [org.apache.maven:maven-core](https://github.com/apache/maven) from 3.6.0 to 3.8.1.
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.6.0...maven-3.8.1)

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

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src/it/projects/MJAVADOC-568_manifest-splitpackage/mojo/pom.xml

@@ -55,7 +55,7 @@
     <dependency>
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-core</artifactId>
-      <version>3.6.0</version>
+      <version>3.8.1</version>
     </dependency>
     <dependency>
       <groupId>org.apache.maven.plugin-tools</groupId>