[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/psf/black: 21.9b0 → 21.10b0](psf/black@21.9b0...21.10b0)

Author: pre-commit-ci[bot]

.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