Bump maven-plugin-api from 3.5.0 to 3.9.1

Bumps [maven-plugin-api](https://github.com/apache/maven) from 3.5.0 to 3.9.1.
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.5.0...maven-3.9.1)

---
updated-dependencies:
- dependency-name: org.apache.maven:maven-plugin-api
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

maven-plugin/pom.xml

@@ -17,7 +17,7 @@
 
    <properties>
       <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-      <version.maven>3.5.0</version.maven>
+      <version.maven>3.9.1</version.maven>
    </properties>
 
    <dependencies>