[pre-commit.ci] pre-commit autoupdate (#401)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -27,7 +27,7 @@ repos:
     hooks:
     -   id: blacken-docs
         additional_dependencies: [black]
--   repo: https://gitlab.com/pycqa/flake8
+-   repo: https://github.com/PyCQA/flake8
     rev: 3.9.0
     hooks:
     -   id: flake8