unittest deprecations have been deferred until 3.12 (#7131)

See python/cpython#30935

Author: AlexWaygood

stdlib/unittest/case.pyi

@@ -232,7 +232,7 @@ class TestCase:
 
     def _formatMessage(self, msg: str | None, standardMsg: str) -> str: ...  # undocumented
     def _getAssertEqualityFunc(self, first: Any, second: Any) -> Callable[..., None]: ...  # undocumented
-    if sys.version_info < (3, 11):
+    if sys.version_info < (3, 12):
         def failUnlessEqual(self, first: Any, second: Any, msg: Any = ...) -> None: ...
         def assertEquals(self, first: Any, second: Any, msg: Any = ...) -> None: ...
         def failIfEqual(self, first: Any, second: Any, msg: Any = ...) -> None: ...