Run maven-source-plugin attach-sources with jar-no-fork

Preferred default by: https://maven.apache.org/plugins/maven-source-plugin/usage.html#installing-the-sources-along-with-your-artifact

and prevents reruns of your `generate sources` phase such as graphql-simple-bindings, openapi generator and wirespec

pom.xml

@@ -453,7 +453,7 @@
                     <execution>
                         <id>attach-sources</id>
                         <goals>
-                            <goal>jar</goal>
+                            <goal>jar-no-fork</goal>
                         </goals>
                     </execution>
                 </executions>