Better test for cache method availability (#54740)

* Better test for cache method availability

  fixes #54737

* try and ignore missing method

* avoid plugin cross contamination

* ammend clog

lib/ansible/plugins/inventory/auto.py

@@ -56,5 +56,7 @@ class InventoryModule(BaseInventoryPlugin):
             raise AnsibleParserError("inventory config '{0}' could not be verified by plugin '{1}'".format(path, plugin_name))
 
         plugin.parse(inventory, loader, path, cache=cache)
-        if getattr(plugin, '_cache', None):
+        try:
             plugin.update_cache_if_changed()
+        except AttributeError:
+            pass