chore: fix linting and ut

scenario/state.py

@@ -29,8 +29,9 @@
 )
 from uuid import uuid4
 
+import ops
 import yaml
-from ops import CloudCredential, CloudSpec, pebble
+from ops import pebble
 from ops.charm import CharmBase, CharmEvents
 from ops.model import SecretRotate, StatusBase
 
@@ -157,7 +158,7 @@ class CloudCredential:
     """A list of redacted secrets."""
 
     def _to_ops_cloud_credential(self):
-        return CloudCredential(
+        return ops.CloudCredential(
             auth_type=self.auth_type,
             attributes=self.attributes,
             redacted=self.redacted,
@@ -196,8 +197,8 @@ class CloudSpec:
     is_controller_cloud: bool = False
     """If this is the cloud used by the controller."""
 
-    def _to_ops_cloud_spec(self) -> CloudSpec:
-        return CloudSpec(
+    def _to_ops_cloud_spec(self) -> ops.CloudSpec:
+        return ops.CloudSpec(
             type=self.type,
             name=self.name,
             region=self.region,