Bump org.apache.maven:maven-plugin-api from 3.9.1 to 3.9.9

Bumps [org.apache.maven:maven-plugin-api](https://github.com/apache/maven) from 3.9.1 to 3.9.9.
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.9.1...maven-3.9.9)

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

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

maven-plugin/pom.xml

@@ -17,7 +17,7 @@
     <url>https://github.com/Kobee1203/schema-org-java</url>
 
     <properties>
-        <maven-plugin-api.version>3.9.1</maven-plugin-api.version>
+        <maven-plugin-api.version>3.9.9</maven-plugin-api.version>
         <maven-plugin-annotations.version>3.13.0</maven-plugin-annotations.version>
         <maven-project.version>2.2.1</maven-project.version>