fix errant type hint

Author: bckohan

src/django_typer/completers/model.py

@@ -9,8 +9,6 @@
 from django.db import models
 from django.db.models.query import QuerySet
 
-P = t.ParamSpec("P")
-
 
 def int_ranges(incomplete: str, max_val: int) -> t.List[t.Tuple[int, int]]:
     lower = int(incomplete)