Don't use class that was removed in Java 17.

Author: mernst

javaparser-symbol-solver-testing/src/test/java/com/github/javaparser/symbolsolver/resolution/typeinference/LeastUpperBoundTest.java

@@ -6,7 +6,8 @@
 import java.io.IOException;
 import java.io.Serializable;
 import java.rmi.AlreadyBoundException;
-import java.rmi.activation.UnknownGroupException;
+// "java.rmi.activation" package was removed from Java 17.
+// import java.rmi.activation.UnknownGroupException;
 import java.util.*;
 import java.util.stream.Collectors;
 
@@ -147,10 +148,12 @@ public void lub_approximation_with_complexe_inheritance() {
         ResolvedType expected = type(Exception.class.getCanonicalName());
         // java.lang.Object/java.lang.Throwable/java.lang.Exception/java.rmi.AlreadyBoundException
         ResolvedType alreadyBoundException = type(AlreadyBoundException.class.getCanonicalName());
+        /*  "java.rmi.activation" package was removed from Java 17.
         // java.lang.Object//java.lang.Throwable/java.lang.Exception/java.rmi.activation.ActivationException/java.rmi.activation.UnknownGroupException
         ResolvedType unknownGroupException = type(UnknownGroupException.class.getCanonicalName());
         ResolvedType lub = leastUpperBound(alreadyBoundException, unknownGroupException);
         assertEquals(expected, lub);
+        */
     }
 
     @Test