chore: use TypeAliasType for Pydantic v2 only

Author: RobertCraigie

src/cloudflare/types/request_tracers/trace.py

@@ -2,11 +2,16 @@
 
 from __future__ import annotations
 
-from typing import List
-from typing_extensions import TypeAliasType
+from typing import TYPE_CHECKING, List
+from typing_extensions import TypeAlias, TypeAliasType
+
+from ..._compat import PYDANTIC_V2
 
 __all__ = ["Trace"]
 
-Trace = TypeAliasType('Trace', List["TraceItem"])
+if TYPE_CHECKING or PYDANTIC_V2:
+    Trace = TypeAliasType('Trace', List["TraceItem"])
+else:
+    Trace: TypeAlias = List["TraceItem"]
 
 from .trace_item import TraceItem