Enables maven:3.8 module for AppStream variant

variants.xml

@@ -125,12 +125,12 @@
       <environment display_order="4">workstation-product-environment</environment>
     </environments>
     <modules>
+      <module>maven:3.8</module>
       <module>nginx:1.22</module>
       <module>nodejs:18</module>
       <module>postgresql:15</module>
       <module>php:8.1</module>
       <module>ruby:3.1</module>
-<!--      <module>maven:3.8</module>-->
     </modules>
   </variant>
   <variant id="CRB" name="CRB" type="variant">