chore: clear strict typehinting errors

dzgui/views/dialogs/wizard.py

@@ -14,7 +14,7 @@ from dzgui.const.constants import (
     HERO_PATH,
     FLATPAK_ROOT_PATH,
     LEGACY_CONFIG_PATH,
-    TMP_PATH
+    TMP_PATH,
 )
 from dzgui.const.boilerplate import config_boilerplate
 from dzgui.const.endpoints import STEAM_API_SETUP
@@ -168,7 +168,12 @@ class NotificationFrame(Gtk.Frame):
 
 class APIValidationPage(EnumeratedWizardPage):
     def __init__(
-        self, enum: PageNum, heading: str, description: str, link: str, func: Callable
+        self,
+        enum: PageNum,
+        heading: str,
+        description: str,
+        link: str,
+        func: Callable[[str], None],
     ) -> None:
         super().__init__(
             enum=enum,