[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

oauth2_provider/views/introspect.py

@@ -2,7 +2,7 @@
 import hashlib
 
 from django.core.exceptions import ObjectDoesNotExist
-from django.http import HttpResponseBadRequest, JsonResponse
+from django.http import JsonResponse
 from django.utils.decorators import method_decorator
 from django.views.decorators.csrf import csrf_exempt