update annotation

Author: jbrockmendel

pandas/core/tools/datetimes.py

@@ -677,7 +677,7 @@ def to_datetime(
     unit: str | None = None,
     origin: str = "unix",
     cache: bool = True,
-) -> DatetimeIndex | Series | DatetimeScalar | NaTType | None:
+) -> DatetimeIndex | Series | DatetimeScalar | NaTType:
     """
     Convert argument to datetime.