pre-commit autoupdate (#848)

Validated with `pre-commit run -a`

.pre-commit-config.yaml

@@ -93,17 +93,17 @@ repos:
         pass_filenames: false
   # Formatters should be run late so that they can re-format any prior changes.
   - repo: https://github.com/psf/black
-    rev: a8b4665e7d6eb945c47820adb1a3f8b006adce0c # frozen: 21.8b0
+    rev: 911470a610e47d9da5ea938b0887c3df62819b85 # frozen: 21.9b0
     hooks:
       - id: black
   - repo: https://github.com/jlebar/pre-commit-hooks.git
-    rev: 2f588005ab7492a82f341c03d0418a155c46100d
+    rev: 7954578f36f10a81b0274a672653e38e46bd99c5
     hooks:
       - id: bazel-buildifier
       - id: clang-format-whole-file
         types: [c++]
   - repo: https://github.com/pre-commit/mirrors-prettier
-    rev: 9c89e53b2d2fd9dac7703623c974133fe3b0e8c4 # frozen: v2.4.0
+    rev: 6e24ff01ab7d5e64045599b81c4cd34d6a6a7159 # frozen: v2.4.1
     hooks:
       - id: prettier
   # Run linters last, as formatters and other checks may fix issues.