fix: Check permissions methods expects any model, not a user model on…

…ly (#270)

Those checks were wrongly typed as it as those methods accept any model. It also makes no sense to limit the objects to the user as it's the user itself checking for a permission in a given object.

Reference: https://docs.djangoproject.com/en/5.1/ref/contrib/auth/#available-authentication-backends

django-stubs/contrib/auth/models.pyi

@@ -56,14 +56,14 @@ class UserManager(BaseUserManager[_T]):
         username: str,
         email: str | None = ...,
         password: str | None = ...,
-        **extra_fields: Any
+        **extra_fields: Any,
     ) -> _T: ...
     def create_superuser(
         self,
         username: str,
         email: str | None,
         password: str | None,
-        **extra_fields: Any
+        **extra_fields: Any,
     ) -> _T: ...
     def with_perm(
         self,
@@ -78,13 +78,11 @@ class PermissionsMixin(models.Model):
     is_superuser = models.BooleanField()
     groups = models.ManyToManyField[Group, Any](Group)
     user_permissions = models.ManyToManyField[Permission, Any](Permission)
-    def get_user_permissions(self, obj: _AnyUser | None = ...) -> set[str]: ...
-    def get_group_permissions(self, obj: _AnyUser | None = ...) -> set[str]: ...
-    def get_all_permissions(self, obj: _AnyUser | None = ...) -> set[str]: ...
-    def has_perm(self, perm: str, obj: _AnyUser | None = ...) -> bool: ...
-    def has_perms(
-        self, perm_list: Iterable[str], obj: _AnyUser | None = ...
-    ) -> bool: ...
+    def get_user_permissions(self, obj: Model | None = ...) -> set[str]: ...
+    def get_group_permissions(self, obj: Model | None = ...) -> set[str]: ...
+    def get_all_permissions(self, obj: Model | None = ...) -> set[str]: ...
+    def has_perm(self, perm: str, obj: Model | None = ...) -> bool: ...
+    def has_perms(self, perm_list: Iterable[str], obj: Model | None = ...) -> bool: ...
     def has_module_perms(self, app_label: str) -> bool: ...
 
 class AbstractUser(AbstractBaseUser, PermissionsMixin):