remove type annotations from multiprocessing. (pythonGH-129381)

* remove type annotations from multiprocessing.

One of them was technically invalid per typing specs... but since we're not
checking these in the stdlib today lets elide them.

https://discuss.python.org/t/static-type-annotations-in-cpython/65068/13

* use the actual comment style annotation format

Co-authored-by: 🇺🇦 Sviatoslav Sydorenko (Святослав Сидоренко) <[email protected]>

---------
(cherry picked from commit 71aecc2)

Co-authored-by: Gregory P. Smith <[email protected]>
Co-authored-by: 🇺🇦 Sviatoslav Sydorenko (Святослав Сидоренко) <[email protected]>

Author: 2 people

Lib/multiprocessing/connection.py

@@ -846,7 +846,7 @@ def PipeClient(address):
 _LEGACY_LENGTHS = (_MD5ONLY_MESSAGE_LENGTH, _MD5_DIGEST_LEN)
 
 
-def _get_digest_name_and_payload(message: bytes) -> (str, bytes):
+def _get_digest_name_and_payload(message):  # type: (bytes) -> tuple[str, bytes]
     """Returns a digest name and the payload for a response hash.
 
     If a legacy protocol is detected based on the message length

Lib/multiprocessing/synchronize.py

@@ -360,7 +360,7 @@ def wait(self, timeout=None):
                 return True
             return False
 
-    def __repr__(self) -> str:
+    def __repr__(self):
         set_status = 'set' if self.is_set() else 'unset'
         return f"<{type(self).__qualname__} at {id(self):#x} {set_status}>"
 #