Update dependency org.apache.maven.plugins:maven-plugin-plugin to v3.15.1

Author: renovate[bot]

cxf-spring-boot-starter-maven-plugin/pom.xml

@@ -39,7 +39,7 @@
 		<jaxb.version>3.0.0</jaxb.version>
 		<jaxws-ri.version>3.0.0</jaxws-ri.version>
 		<mojo-executor.version>2.3.1</mojo-executor.version>
-		<maven-plugin-plugin.version>3.6.0</maven-plugin-plugin.version>
+		<maven-plugin-plugin.version>3.15.1</maven-plugin-plugin.version>
 		<maven-plugin-annotations.version>3.6.0</maven-plugin-annotations.version>
 		<maven-plugin-api.version>3.6.3</maven-plugin-api.version>