Increment version to 4.21.2 for release

- Updated `pom.xml` to finalize version for deployment and release

Author: KlausRicharz

pom.xml

@@ -10,7 +10,7 @@
   </parent>
   <groupId>de.hbt.salat</groupId>
   <artifactId>tb</artifactId>
-  <version>4.21.2-SNAPSHOT</version>
+  <version>4.21.2</version>
   <packaging>war</packaging>
 
   <properties>