[pre-commit.ci] pre-commit autoupdate (jpadilla#640)

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

@@ -11,7 +11,7 @@ repos:
       - id: blacken-docs
         args: ["--target-version=py36"]
 
-  - repo: https://gitlab.com/pycqa/flake8
+  - repo: https://github.com/PyCQA/flake8
     rev: 3.9.0
     hooks:
       - id: flake8