[python-dateutil] Add missing parameter annotations (#14996)

stubs/python-dateutil/dateutil/tz/_common.pyi

@@ -1,12 +1,17 @@
 import abc
+from collections.abc import Callable
 from datetime import datetime, timedelta, tzinfo
-from typing import ClassVar
+from typing import ClassVar, TypeVar
+from typing_extensions import ParamSpec
 
 ZERO: timedelta
 
 __all__ = ["tzname_in_python2", "enfold"]
 
-def tzname_in_python2(namefunc): ...
+_P = ParamSpec("_P")
+_R = TypeVar("_R")
+
+def tzname_in_python2(namefunc: Callable[_P, _R]) -> Callable[_P, _R]: ...
 def enfold(dt: datetime, fold: int = 1): ...
 
 # Doesn't actually have ABCMeta as the metaclass at runtime,

stubs/python-dateutil/dateutil/tz/win.pyi

@@ -1,5 +1,5 @@
 import sys
-from ctypes import _Pointer, c_wchar
+from ctypes import _NameTypes, _Pointer, c_wchar
 from datetime import datetime, timedelta
 from typing import Any, ClassVar, Final
 
@@ -18,9 +18,10 @@ if sys.platform == "win32":
 
     class tzres:
         p_wchar: ClassVar[type[_Pointer[c_wchar]]]
-        def __init__(self, tzres_loc="tzres.dll"): ...
-        def load_name(self, offset): ...
-        def name_from_string(self, tzname_str: str): ...
+        tzres_loc: _NameTypes
+        def __init__(self, tzres_loc: _NameTypes = "tzres.dll") -> None: ...
+        def load_name(self, offset: int) -> str: ...
+        def name_from_string(self, tzname_str: str) -> str: ...
 
     def picknthweekday(year: int, month: int, dayofweek: int, hour: int, minute: int, whichweek: int) -> datetime: ...
     def valuestodict(key: _KeyType) -> dict[str, Any]: ...  # keys and values in dict are results of winreg.EnumValue() function

stubs/python-dateutil/dateutil/zoneinfo/rebuild.pyi

@@ -1,4 +1,8 @@
 from _typeshed import StrOrBytesPath
 from collections.abc import Iterable
 
-def rebuild(filename: StrOrBytesPath, tag=None, format: str = "gz", zonegroups: Iterable[str] = [], metadata=None) -> None: ...
+from ..zoneinfo import _MetadataType
+
+def rebuild(
+    filename: StrOrBytesPath, tag=None, format: str = "gz", zonegroups: Iterable[str] = [], metadata: _MetadataType | None = None
+) -> None: ...