docs(v3): fix build error (#4065)

Author: provinzkraut

litestar/openapi/spec/security_requirement.py

@@ -1,6 +1,6 @@
-from __future__ import annotations
+from typing_extensions import TypeAlias
 
-SecurityRequirement = dict[str, list[str]]
+SecurityRequirement: TypeAlias = "dict[str, list[str]]"
 """Lists the required security schemes to execute this operation. The name used for each property MUST correspond to a
 security scheme declared in the.