Move structlog imports into a TYPE_CHECKING block to untie version bumps (#57335)

Author: amoghrajesh

airflow-ctl/pyproject.toml

@@ -35,7 +35,7 @@ dependencies = [
     "platformdirs>=4.3.6",
     "pydantic>=2.11.0", # https://github.com/apache/airflow/issues/56482
     "rich-argparse>=1.0.0",
-    "structlog>=25.2.0",
+    "structlog>=25.4.0",
     "uuid6>=2024.7.10",
     "tabulate>=0.9.0",
 ]

shared/logging/src/airflow_shared/logging/percent_formatter.py

@@ -26,17 +26,20 @@
 from typing import TYPE_CHECKING, ClassVar
 
 import structlog.dev
-from structlog.dev import ConsoleRenderer, Styles
+from structlog.dev import ConsoleRenderer
 from structlog.processors import CallsiteParameter
 
 if TYPE_CHECKING:
+    from structlog.dev import ColumnStyles
     from structlog.typing import EventDict, WrappedLogger
 
 
 class _LazyLogRecordDict(collections.abc.Mapping):
     __slots__ = ("event", "styles", "level_styles", "method_name", "no_colors")
 
-    def __init__(self, event: EventDict, method_name: str, level_styles: dict[str, str], styles: Styles):
+    def __init__(
+        self, event: EventDict, method_name: str, level_styles: dict[str, str], styles: ColumnStyles
+    ):
         self.event = event
         self.method_name = method_name
         self.level_styles = level_styles