Merge pull request #376 from django-haystack/pre-commit-ci-update-config

[pre-commit.ci] pre-commit autoupdate

Author: acdha

.pre-commit-config.yaml

@@ -4,7 +4,7 @@ repos:
       hooks:
           - id: isort
     - repo: https://github.com/psf/black
-      rev: 21.9b0
+      rev: 21.10b0
       hooks:
           - id: black
     - repo: https://github.com/pre-commit/pre-commit-hooks