manifest: fix mypy signature of _PatchedConfiguration.get()

This was the only --check-untyped-defs warning in manifest.py: easy win.

Signed-off-by: Marc Herbert <[email protected]>

Author: marc-hb

src/west/manifest.py

@@ -2854,7 +2854,9 @@ def __init__(self, patch_dict, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.__patch_dict = patch_dict
 
-    def get(self, option, **kwargs):
+    def get(
+        self, option: str, default: str | None = None, configfile: ConfigFile = ConfigFile.ALL
+    ) -> str | None:
         if option in self.__patch_dict:
             return self.__patch_dict[option]
-        return super().get(option, **kwargs)
+        return super().get(option, default, configfile)