Update mypy to 1.16.0 (#14194)

Co-authored-by: Sebastian Rittau <srittau@rittau.biz>
Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

stdlib/@tests/stubtest_allowlists/common.txt

@@ -210,6 +210,8 @@ _?ast.stmt.__init__
 
 _ast.ImportFrom.level  # None on the class, but never None on instances
 
+argparse.Namespace.__setattr__  # should allow setting any attribute
+
 ast.ImportFrom.level  # None on the class, but never None on instances
 ast.NodeVisitor.visit_\w+  # Methods are discovered dynamically, see #3796
 _?asyncio.Future.__init__  # Usually initialized from c object
@@ -272,7 +274,9 @@ _?ctypes.Array._length_  # _length_ is abstract, https://github.com/python/types
 _?ctypes.Array.raw  # exists but stubtest can't see it; only available if _CT == c_char
 ctypes.CDLL._FuncPtr  # None at class level but initialized in __init__ to this value
 _?ctypes.Structure.__getattr__  # doesn't exist, but makes things easy if we pretend it does
+_?ctypes.Structure.__setattr__  # doesn't exist, but makes things easy if we pretend it does
 _?ctypes.Union.__getattr__  # doesn't exist, but makes things easy if we pretend it does
+_?ctypes.Union.__setattr__  # doesn't exist, but makes things easy if we pretend it does
 
 # Iterable classes that don't define __iter__ at runtime (usually iterable via __getitem__)
 # These would ideally be special-cased by type checkers; see https://github.com/python/mypy/issues/2220
@@ -323,6 +327,8 @@ inspect.Signature.__init__
 inspect.Parameter.empty  # set as private marker _empty
 inspect.Signature.empty  # set as private marker _empty
 
+logging.LogRecord.__setattr__  # doesn't exist, but makes things easy if we pretend it does
+
 # Iterable classes that don't define __iter__ at runtime (usually iterable via __getitem__)
 # These would ideally be special-cased by type checkers; see https://github.com/python/mypy/issues/2220
 mmap.mmap.__iter__
@@ -380,7 +386,9 @@ multiprocessing.synchronize.SemLock.acquire
 multiprocessing.synchronize.SemLock.release
 
 numbers.Number.__hash__  # typeshed marks this as abstract but code just sets this as None
+
 optparse.Values.__getattr__  # Some attributes are set in __init__ using setattr
+optparse.Values.__setattr__  # doesn't exist, but makes things easy if we pretend it does
 
 os._wrap_close.read  # Methods that come from __getattr__() at runtime
 os._wrap_close.readable  # Methods that come from __getattr__() at runtime

stdlib/@tests/stubtest_allowlists/py312.txt

@@ -13,6 +13,10 @@ zoneinfo.ZoneInfo.from_file  # Pos-only parameters had different "names" in diff
 typing_extensions.TypeAliasType.__parameters__
 typing_extensions.TypeAliasType.__value__
 
+# Types that require `__setattr__` and `__delattr__` for typing purposes:
+types.SimpleNamespace.__setattr__
+types.SimpleNamespace.__delattr__
+
 
 # ====================================
 # Pre-existing errors from Python 3.11

stdlib/@tests/stubtest_allowlists/py313.txt

@@ -18,6 +18,10 @@ zoneinfo.ZoneInfo.from_file  # Pos-only parameters had different "names" in diff
 typing_extensions.TypeAliasType.__parameters__
 typing_extensions.TypeAliasType.__value__
 
+# Types that require `__setattr__` and `__delattr__` for typing purposes:
+types.SimpleNamespace.__setattr__
+types.SimpleNamespace.__delattr__
+
 
 # =======
 # >= 3.11

stdlib/@tests/stubtest_allowlists/py314.txt

@@ -55,6 +55,10 @@ functools.partialmethod.__new__
 
 zoneinfo.ZoneInfo.from_file  # Pos-only parameters had different "names" in different Python versions
 
+# Types that require `__setattr__` and `__delattr__` for typing purposes:
+types.SimpleNamespace.__setattr__
+types.SimpleNamespace.__delattr__
+
 
 # =======
 # >= 3.11
@@ -101,10 +105,6 @@ typing(_extensions)?\.IO\.writelines
 # Allowlist entries that cannot or should not be fixed; >= 3.14
 # =============================================================
 
-# Internal annotations machinery
-.*\.__annotate_func__
-.*\.__annotations_cache__
-
 # Undocumented private attributes
 .*\.ForwardRef\.__arg__
 .*\.ForwardRef\.__ast_node__