Delete unused allowlist entries (#10676)

3.12.0rc2 was just released

Author: AlexWaygood

tests/stubtest_allowlists/darwin-py312.txt

@@ -27,6 +27,3 @@ xxlimited.Xxo.x_exports
 (locale.dgettext)?
 (locale.gettext)?
 (locale.textdomain)?
-
-# should be removable once 3.12.0rc2 is released:
-posix.lseek

tests/stubtest_allowlists/linux-py312.txt

@@ -43,6 +43,3 @@ tty.__all__
 tty.cfmakecbreak
 tty.cfmakeraw
 xxlimited.Xxo.x_exports
-
-# should be removable once 3.12.0rc2 is released:
-posix.lseek

tests/stubtest_allowlists/py312.txt

@@ -132,7 +132,3 @@ typing.SupportsAbs.__type_params__
 typing.SupportsRound.__type_params__
 typing_extensions.SupportsAbs.__type_params__
 typing_extensions.SupportsRound.__type_params__
-
-# These two should be removable after 3.12rc2 is released:
-types.CodeType.replace  # stubtest thinks default values are None but None doesn't work at runtime
-os.lseek  # a pos-only parameter name changed in py311/py312