Merge pull request #257 from pytest-dev/pre-commit-ci-update-config

[pre-commit.ci] pre-commit autoupdate

Author: nicoddemus

.pre-commit-config.yaml

@@ -1,7 +1,7 @@
 exclude: '^($|.*\.bin)'
 repos:
   - repo: https://github.com/psf/black
-    rev: 21.8b0
+    rev: 21.9b0
     hooks:
       - id: black
         args: [--safe, --quiet]