Bump maven.version from 3.9.8 to 3.9.9

Bumps `maven.version` from 3.9.8 to 3.9.9.

Updates `org.apache.maven:maven-plugin-api` from 3.9.8 to 3.9.9
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.9.8...maven-3.9.9)

Updates `org.apache.maven:maven-core` from 3.9.8 to 3.9.9

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

Signed-off-by: dependabot[bot] <[email protected]>

pom.xml

@@ -16,7 +16,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <compiler.version>1.8</compiler.version>
 
-        <maven.version>3.9.8</maven.version>
+        <maven.version>3.9.9</maven.version>
         <maven-plugin.version>3.7.0</maven-plugin.version>
 
         <pmd.version>6.41.0</pmd.version>