[cloud] Support check_mode for ec2_vpc_route_table_facts (#23116)

As a facts module, just needs supports_check_mode to be
set in the argument_spec

lib/ansible/modules/cloud/amazon/ec2_vpc_route_table_facts.py

@@ -116,7 +116,8 @@ def main():
         )
     )
 
-    module = AnsibleModule(argument_spec=argument_spec)
+    module = AnsibleModule(argument_spec=argument_spec,
+                           supports_check_mode=True)
 
     if not HAS_BOTO:
         module.fail_json(msg='boto required for this module')