Merge pull request #1470 from jupyter/pre-commit-ci-update-config

[pre-commit.ci] pre-commit autoupdate

Author: consideRatio

.pre-commit-config.yaml

@@ -12,14 +12,14 @@ repos:
 
   # Autoformat: Python code
   - repo: https://github.com/psf/black
-    rev: 21.8b0
+    rev: 21.9b0
     hooks:
       - id: black
         args: [--target-version=py39]
 
   # Autoformat: YAML, JSON, Markdown, etc.
   - repo: https://github.com/pre-commit/mirrors-prettier
-    rev: v2.4.0
+    rev: v2.4.1
     hooks:
       - id: prettier