fix: Fix black 26.3.1 formatting changes

Black 26.3.1 reformatting removed blank lines after docstrings at the top of files.
This change applies the automatic reformatting to keep the code consistent.

Signed-off-by: Mathias L. Baumann <mathias.baumann@frequenz.com>

Author: Marenz

src/frequenz/client/dispatch/_internal_types.py

@@ -3,7 +3,6 @@
 
 """Type wrappers for the generated protobuf messages."""
 
-
 from dataclasses import dataclass
 from datetime import datetime, timedelta
 from typing import Any, Literal

src/frequenz/client/dispatch/test/_service.py

@@ -5,6 +5,7 @@
 
 Useful for testing.
 """
+
 import logging
 from dataclasses import dataclass, replace
 from datetime import datetime, timezone

src/frequenz/client/dispatch/types.py

@@ -3,7 +3,6 @@
 
 """Type wrappers for the generated protobuf messages."""
 
-
 from dataclasses import dataclass
 from datetime import datetime, timedelta, timezone
 from enum import Enum