[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/psf/black: 20.8b1 → 21.10b0](psf/black@20.8b1...21.10b0)

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
   - repo: https://github.com/psf/black
-    rev: 20.8b1 # Replace by any tag/version: https://github.com/psf/black/tags
+    rev: 21.10b0 # Replace by any tag/version: https://github.com/psf/black/tags
     hooks:
       - id: black
         language_version: python3 # Should be a command that runs python3.6+