builtins: add BaseException.add_note in py311 (#7860)

stdlib/builtins.pyi

@@ -1654,10 +1654,12 @@ class BaseException:
     __context__: BaseException | None
     __suppress_context__: bool
     __traceback__: TracebackType | None
-    if sys.version_info >= (3, 11):
-        __note__: str | None
     def __init__(self, *args: object) -> None: ...
     def with_traceback(self: Self, __tb: TracebackType | None) -> Self: ...
+    if sys.version_info >= (3, 11):
+        # only present after add_note() is called
+        __notes__: list[str]
+        def add_note(self, __note: str) -> None: ...
 
 class GeneratorExit(BaseException): ...
 class KeyboardInterrupt(BaseException): ...

tests/stubtest_allowlists/py311.txt

@@ -43,7 +43,6 @@ asyncio.sslproto._SSLProtocolTransport.set_read_buffer_limits
 asyncio.sslproto.add_flowcontrol_defaults
 bdb.Breakpoint.clearBreakpoints
 binascii.a2b_base64
-builtins.BaseException.add_note
 builtins.dict.get
 builtins.property.__set_name__  # Doesn't actually exist
 concurrent.futures.ProcessPoolExecutor.__init__