Fix linter by properly checking type (DataDog#2706)

* fix linting

* isinstance

* Fix

Author: sarah-witt

upbound_uxp/datadog_checks/upbound_uxp/check.py

@@ -393,7 +393,7 @@ def _merge_conf(self):
                 for k in metric:
                     if k not in m:
                         m.append(k)
-                        if type(k) == 'int':
+                        if isinstance(k, int):
                             if metric[k] is not None:
                                 self.metrics_map[k] = metric[k]