fix: fix typing for PermissionOverwrite.update

Author: JL710

CHANGELOG.md

@@ -140,6 +140,8 @@ These changes are available on the `master` branch, but have not yet been releas
   ([#2843](https://github.com/Pycord-Development/pycord/pull/2843))
 - Fixed `TypeError` when using `@option` with certain annotations and along with
   `channel_types`. ([#2835](https://github.com/Pycord-Development/pycord/pull/2835))
+- Fixed type hint for `PermissionOverwrite.update`
+  ([#2878](https://github.com/Pycord-Development/pycord/pull/2878))
 
 ### Changed
 

discord/permissions.py

@@ -860,7 +860,7 @@ def is_empty(self) -> bool:
         """
         return len(self._values) == 0
 
-    def update(self, **kwargs: bool) -> None:
+    def update(self, **kwargs: bool | None) -> None:
         r"""Bulk updates this permission overwrite object.
 
         Allows you to set multiple attributes by using keyword