Update sys.pyi for Python3.12 (#10245)

Source: https://github.com/python/cpython/blob/3.12/Python/sysmodule.c
Docs: https://github.com/python/cpython/blob/3.12/Doc/library/sys.rst

Author: sobolevn

stdlib/sys.pyi

@@ -359,3 +359,13 @@ if sys.version_info < (3, 8):
 # as part of the response to CVE-2020-10735
 def set_int_max_str_digits(maxdigits: int) -> None: ...
 def get_int_max_str_digits() -> int: ...
+
+if sys.version_info >= (3, 12):
+    def getunicodeinternedsize() -> int: ...
+    def deactivate_stack_trampoline() -> None: ...
+    def is_stack_trampoline_active() -> bool: ...
+    # It always exists, but raises on non-linux platforms:
+    if sys.platform == "linux":
+        def activate_stack_trampoline(__backend: str) -> None: ...
+    else:
+        def activate_stack_trampoline(__backend: str) -> NoReturn: ...

tests/stubtest_allowlists/py312.txt

@@ -179,10 +179,6 @@ ssl.OP_LEGACY_SERVER_CONNECT
 ssl.Options.OP_LEGACY_SERVER_CONNECT
 ssl.RAND_pseudo_bytes
 ssl.wrap_socket
-sys.activate_stack_trampoline
-sys.deactivate_stack_trampoline
-sys.getunicodeinternedsize
-sys.is_stack_trampoline_active
 tarfile.AbsoluteLinkError
 tarfile.AbsolutePathError
 tarfile.FilterError