Fix typing issues.

src/click/decorators.py

@@ -2,6 +2,7 @@
 
 import inspect
 import typing as t
+from collections import abc
 from functools import update_wrapper
 from gettext import gettext as _
 
@@ -531,7 +532,7 @@ class HelpOption(Option):
 
     def __init__(
         self,
-        param_decls: t.Optional[t.Sequence[str]] = None,
+        param_decls: abc.Sequence[str] | None = None,
         **kwargs: t.Any,
     ) -> None:
         if not param_decls:

src/click/exceptions.py

@@ -33,7 +33,7 @@ def __init__(self, message: str) -> None:
         super().__init__(message)
         # The context will be removed by the time we print the message, so cache
         # the color settings here to be used later on (in `show`)
-        self.show_color: t.Optional[bool] = resolve_color_default()
+        self.show_color: bool | None = resolve_color_default()
         self.message = message
 
     def format_message(self) -> str: