[CodeStyle] Apply linter rules.

Author: gmarciani

cli/src/pcluster/config/cluster_config.py

@@ -32,7 +32,9 @@
     DefaultUserHomeType,
 )
 from pcluster.config.common import Imds as TopLevelImds
-from pcluster.config.common import Resource
+from pcluster.config.common import (
+    Resource,
+)
 from pcluster.constants import (
     CIDR_ALL_IPS,
     CW_ALARMS_ENABLED_DEFAULT,