Bump mavenVersion from 3.2.5 to 3.9.1

Bumps `mavenVersion` from 3.2.5 to 3.9.1.

Updates `maven-plugin-api` from 3.2.5 to 3.9.1
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.2.5...maven-3.9.1)

Updates `maven-core` from 3.2.5 to 3.9.1
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.2.5...maven-3.9.1)

Updates `maven-artifact` from 3.2.5 to 3.9.1
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.2.5...maven-3.9.1)

Updates `maven-model` from 3.2.5 to 3.9.1
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.2.5...maven-3.9.1)

Updates `maven-model-builder` from 3.2.5 to 3.9.1
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.2.5...maven-3.9.1)

Updates `maven-settings` from 3.2.5 to 3.9.1
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.2.5...maven-3.9.1)

---
updated-dependencies:
- dependency-name: org.apache.maven:maven-plugin-api
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.apache.maven:maven-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.apache.maven:maven-artifact
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.apache.maven:maven-model
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.apache.maven:maven-model-builder
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.apache.maven:maven-settings
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -62,7 +62,7 @@ under the License.
   </distributionManagement>
 
   <properties>
-    <mavenVersion>3.2.5</mavenVersion>
+    <mavenVersion>3.9.1</mavenVersion>
     <javaVersion>8</javaVersion>
     <project.build.outputTimestamp>2021-05-05T16:39:01Z</project.build.outputTimestamp>
     <resource.delimiter>@</resource.delimiter>