AER-4192 intellij needs a java version set on gwt else it reverts to java 6

Author: willvoo

source/imaer-shared/pom.xml

@@ -32,7 +32,6 @@
   <properties>
     <!-- For GWT, keep target java version on 17 to avoid using unusable language features -->
     <java.version>17</java.version>
-    <maven.compiler.release>${java.version}</maven.compiler.release>
   </properties>
 
   <dependencies>
@@ -113,6 +112,7 @@
         <artifactId>gwt-maven-plugin</artifactId>
         <extensions>true</extensions>
         <configuration>
+          <sourceLevel>${java.version}</sourceLevel>
           <skipModule>true</skipModule>
           <moduleName>nl.overheid.aerius.ImaerShared</moduleName>
         </configuration>