Autoupdate pre-commit-config (#824)

(manually switching from gitlab to github for flake8)

.pre-commit-config.yaml

@@ -95,21 +95,21 @@ 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: e3000ace2fd1fcb1c181bb7a8285f1f976bcbdc7 # frozen: 21.7b0
+    rev: a8b4665e7d6eb945c47820adb1a3f8b006adce0c # frozen: 21.8b0
     hooks:
       - id: black
   - repo: https://github.com/jlebar/pre-commit-hooks.git
-    rev: 07a539b8db43298f124ace23c90b4b871911b8c4
+    rev: 2f588005ab7492a82f341c03d0418a155c46100d
     hooks:
       - id: bazel-buildifier
       - id: clang-format-whole-file
         types: [c++]
   - repo: https://github.com/pre-commit/mirrors-prettier
-    rev: bc48c541add1551be726f23c4294c773442341cb # frozen: v2.3.2
+    rev: 9c89e53b2d2fd9dac7703623c974133fe3b0e8c4 # frozen: v2.4.0
     hooks:
       - id: prettier
   # Run linters last, as formatters and other checks may fix issues.
-  - repo: https://gitlab.com/PyCQA/flake8
+  - repo: https://github.com/PyCQA/flake8
     rev: dcd740bc0ebaf2b3d43e59a0060d157c97de13f3 # frozen: 3.9.2
     hooks:
       - id: flake8