Update typing-extensions to 4.14.0rc1 (#14139)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

stdlib/@tests/stubtest_allowlists/py310.txt

@@ -77,6 +77,10 @@ importlib.metadata._meta.SimplePath.__truediv__  # Runtime definition of protoco
 builtins.float.__setformat__  # Internal method for CPython test suite
 typing._SpecialForm.__mro_entries__  # Exists at runtime, but missing from stubs
 
+# Will always raise. Not included to avoid type checkers inferring that
+# Sentinel instances are callable.
+typing_extensions.Sentinel.__call__
+
 
 # =======
 # <= 3.10

stdlib/@tests/stubtest_allowlists/py314.txt

@@ -169,10 +169,10 @@ typing(_extensions)?\.IO\.writelines
 .*\.ForwardRef\.__stringifier_dict__
 
 # These protocols use ABC hackery at runtime.
-io.Reader.__class_getitem__
-io.Reader.read
-io.Writer.__class_getitem__
-io.Writer.write
+(io|typing_extensions)\.Reader\.__class_getitem__
+(io|typing_extensions)\.Reader\.read
+(io|typing_extensions)\.Writer\.__class_getitem__
+(io|typing_extensions)\.Writer\.write
 
 
 # =============================================================

stdlib/@tests/stubtest_allowlists/py39.txt

@@ -44,6 +44,10 @@ tempfile.SpooledTemporaryFile.writable
 
 tkinter.Tk.split  # Exists at runtime, but missing from stubs
 
+# Will always raise. Not included to avoid type checkers inferring that
+# Sentinel instances are callable.
+typing_extensions.Sentinel.__call__
+
 
 # =======
 # <= 3.11