Set project version to 0.5.21

Author: kevinwallimann

pom.xml

@@ -17,7 +17,7 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 
     <modelVersion>4.0.0</modelVersion>
-    <version>0.5.21-SNAPSHOT</version>
+    <version>0.5.21</version>
 
     <parent>
         <groupId>za.co.absa</groupId>