chore: Set version to 2.5.11

Author: mkellnhofer

pom.xml

@@ -7,7 +7,7 @@
 
     <groupId>com.dracoon</groupId>
     <artifactId>dracoon-sdk</artifactId>
-    <version>2.5.11-SNAPSHOT</version>
+    <version>2.5.11</version>
 
     <name>Dracoon SDK</name>
     <description>The Dracoon SDK for Java.</description>