Bump org.apache.maven.plugins:maven-plugin-plugin from 3.8.1 to 3.15.1

Bumps [org.apache.maven.plugins:maven-plugin-plugin](https://github.com/apache/maven-plugin-tools) from 3.8.1 to 3.15.1.
- [Release notes](https://github.com/apache/maven-plugin-tools/releases)
- [Commits](apache/maven-plugin-tools@maven-plugin-tools-3.8.1...maven-plugin-tools-3.15.1)

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

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

certificate-generator-maven-plugin/pom.xml

@@ -37,7 +37,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-plugin-plugin</artifactId>
-                <version>3.8.1</version>
+                <version>3.15.1</version>
                 <executions>
                     <execution>
                         <id>help-mojo</id>