Use relative imports

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

src/frequenz/sdk/config/_logging_actor.py

@@ -13,7 +13,7 @@
 from frequenz.channels import Receiver
 from marshmallow_dataclass import dataclass
 
-from frequenz.sdk.actor import Actor
+from ..actor import Actor
 
 from ._util import load_config