[FIX] base: Make user apikeys ondelete cascade on user_id

This could prevent the user deletion if linked to a record of this
type, like a auth_totp.device which inherits from this model.

Part-of: odoo/odoo#114656

odoo/addons/base/models/res_users.py

@@ -1990,7 +1990,7 @@ class APIKeys(models.Model):
         CREATE TABLE IF NOT EXISTS {table} (
             id serial primary key,
             name varchar not null,
-            user_id integer not null REFERENCES res_users(id),
+            user_id integer not null REFERENCES res_users(id) ON DELETE CASCADE,
             scope varchar,
             index varchar({index_size}) not null CHECK (char_length(index) = {index_size}),
             key varchar not null,