__future__._Feature.getMandatoryRelease() can return None (#8232)

Co-authored-by: KotlinIsland <[email protected]>
Co-authored-by: Alex Waygood <[email protected]>

Author: KotlinIsland

stdlib/__future__.pyi

@@ -1,9 +1,12 @@
 import sys
+from typing_extensions import TypeAlias
+
+_VersionInfo: TypeAlias = tuple[int, int, int, str, int]
 
 class _Feature:
-    def __init__(self, optionalRelease: sys._version_info, mandatoryRelease: sys._version_info, compiler_flag: int) -> None: ...
-    def getOptionalRelease(self) -> sys._version_info: ...
-    def getMandatoryRelease(self) -> sys._version_info: ...
+    def __init__(self, optionalRelease: _VersionInfo, mandatoryRelease: _VersionInfo | None, compiler_flag: int) -> None: ...
+    def getOptionalRelease(self) -> _VersionInfo: ...
+    def getMandatoryRelease(self) -> _VersionInfo | None: ...
     compiler_flag: int
 
 absolute_import: _Feature