[openapi-maven-plugin] Fix groupId, use io.avaje (rather than org.avaje)

Author: rbygrave

openapi-maven-plugin/pom.xml

@@ -7,6 +7,7 @@
     <version>3.9</version>
   </parent>
 
+  <groupId>io.avaje</groupId>
   <artifactId>openapi-maven-plugin</artifactId>
   <version>1.0</version>
   <packaging>maven-plugin</packaging>