bump version to 2.4.0

Author: nobodyiam

pom.xml

@@ -60,7 +60,7 @@
   </developers>
 
   <properties>
-    <revision>2.4.0-SNAPSHOT</revision>
+    <revision>2.4.0</revision>
     <java.version>1.8</java.version>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <spring-boot.version>2.7.18</spring-boot.version>