Use sdk shared library references in serde source code (#59591)

Author: amoghrajesh

task-sdk/src/airflow/sdk/serde/__init__.py

@@ -29,9 +29,9 @@
 
 import attr
 
-from airflow.observability.stats import Stats
 from airflow.sdk._shared.module_loading import import_string, iter_namespace, qualname
 from airflow.sdk.configuration import conf
+from airflow.sdk.observability.stats import Stats
 from airflow.sdk.serde.typing import is_pydantic_model
 
 if TYPE_CHECKING:

task-sdk/src/airflow/sdk/serde/serializers/datetime.py

@@ -19,7 +19,7 @@
 
 from typing import TYPE_CHECKING
 
-from airflow._shared.timezones.timezone import parse_timezone
+from airflow.sdk._shared.timezones.timezone import parse_timezone
 from airflow.sdk.module_loading import qualname
 from airflow.sdk.serde.serializers.timezone import (
     deserialize as deserialize_timezone,

task-sdk/src/airflow/sdk/serde/serializers/timezone.py

@@ -70,7 +70,7 @@ def serialize(o: object) -> tuple[U, str, int, bool]:
 def deserialize(cls: type, version: int, data: object) -> Any:
     from zoneinfo import ZoneInfo
 
-    from airflow._shared.timezones.timezone import parse_timezone
+    from airflow.sdk._shared.timezones.timezone import parse_timezone
 
     if not isinstance(data, (str, int)):
         raise TypeError(f"{data} is not of type int or str but of {type(data)}")