[#1544] Remove AttachableInternal.getAttachables() - Throw an

UnsupportedOperationException in AbstractQueryPart.getDialect()

jOOQ/src/main/java/org/jooq/impl/AbstractQueryPart.java

@@ -105,7 +105,7 @@ abstract class AbstractQueryPart implements QueryPartInternal, AttachableInterna
     @Override
     @Deprecated
     public final SQLDialect getDialect() {
-        return getConfiguration().getDialect();
+        throw new UnsupportedOperationException("This method is no longer supported");
     }
 
     /**