Update type hints

Author: topper-123

pandas/io/html.py

@@ -931,14 +931,14 @@ def read_html(
     match: Union[str, Pattern] = ".+",
     flavor: Optional[str] = None,
     header: Optional[Union[int, Sequence[int]]] = None,
-    index_col: Union[int, Sequence[int], None] = None,
-    skiprows: Union[int, Sequence[int], slice, None] = None,
+    index_col: Optional[Union[int, Sequence[int]]] = None,
+    skiprows: Optional[Union[int, Sequence[int], slice]] = None,
     attrs: Optional[Dict[str, str]] = None,
     parse_dates: bool = False,
     thousands: Optional[str] = ",",
     encoding: Optional[str] = None,
     decimal: str = ".",
-    converters: Optional[dict] = None,
+    converters: Optional[Dict] = None,
     na_values=None,
     keep_default_na: bool = True,
     displayed_only: bool = True,