Prepate maven plugin for release 4.1.6

Author: kobylynskyi

plugins/maven/graphql-java-codegen-maven-plugin/pom.xml

@@ -4,7 +4,7 @@
 
     <groupId>io.github.kobylynskyi</groupId>
     <artifactId>graphql-codegen-maven-plugin</artifactId>
-    <version>4.1.6</version>
+    <version>4.1.6-SNAPSHOT</version>
     <packaging>maven-plugin</packaging>
 
     <name>graphql-codegen-maven-plugin</name>