devonfw#1024: fixed pom.xml

Author: jan-vcapgemini

pom.xml

@@ -20,8 +20,6 @@
     <github.repository>IDEasy</github.repository>
     <ide_version>${revision}</ide_version>
     <java.version>21</java.version>
-    <maven.compiler.source>21</maven.compiler.source>
-    <maven.compiler.target>21</maven.compiler.target>
     <jline.version>3.24.1</jline.version>
     <jansi.version>2.4.1</jansi.version>
     <jackson.version>2.18.2</jackson.version>