[pom] Drop jdk 20 from allowed build list

Author: hazendaz

pom.xml

@@ -154,7 +154,7 @@
     <!-- Reproducible Builds -->
     <project.build.outputTimestamp>1678513628</project.build.outputTimestamp>
 
-    <allowed.build.jdks>[11,12),[17,18),[20,21),[21,22),[22,23)</allowed.build.jdks>
+    <allowed.build.jdks>[11,12),[17,18),[21,22),[22,23)</allowed.build.jdks>
   </properties>
 
   <dependencies>