[pre-commit.ci] pre-commit autoupdate (#363)

pre-commit-ci[bot] · web-flow · commit ec53c8891e96 · 2021-09-21T12:38:42.000+01:00
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
@@ -16,7 +16,7 @@ repos:
   - id: pyupgrade
     args: [--py36-plus]
 - repo: https://github.com/psf/black
-  rev: 21.8b0
+  rev: 21.9b0
   hooks:
   - id: black
 - repo: https://github.com/asottile/blacken-docs
