use strict typing for tslibs/nattype and tslibs/dtypes (#1155)

* use strict typing for tslibs/nattype and tslibs/dtypes

* remove unused

Author: MarcoGorelli

pandas-stubs/_libs/tslibs/dtypes.pyi

@@ -1,3 +1,4 @@
+# pyright: strict
 from datetime import (
     datetime,
     timedelta,
@@ -11,7 +12,10 @@ from typing_extensions import (
 )
 
 from pandas._libs.tslibs.period import Period
-from pandas._typing import TimeUnit
+from pandas._typing import (
+    NpDtype,
+    TimeUnit,
+)
 
 NaT: NaTType
 iNaT: int
@@ -30,7 +34,7 @@ class NaTType:
     def asm8(self) -> np.datetime64: ...
     def to_datetime64(self) -> np.datetime64: ...
     def to_numpy(
-        self, dtype: np.dtype | str | None = ..., copy: bool = ...
+        self, dtype: NpDtype | None = ..., copy: bool = ...
     ) -> np.datetime64 | np.timedelta64: ...
     @property
     def is_leap_year(self) -> bool: ...
@@ -67,8 +71,8 @@ class NaTType:
     def weekday(self) -> float: ...
     def isoweekday(self) -> float: ...
     def total_seconds(self) -> float: ...
-    def today(self, *args, **kwargs) -> NaTType: ...
-    def now(self, *args, **kwargs) -> NaTType: ...
+    def today(self, tz: _tzinfo | str | None = ...) -> NaTType: ...
+    def now(self, tz: _tzinfo | str | None = ...) -> NaTType: ...
     def to_pydatetime(self) -> NaTType: ...
     def date(self) -> NaTType: ...
     def round(self) -> NaTType: ...