[pre-commit.ci] pre-commit autoupdate (#2040)

updates:
- [github.com/PyCQA/flake8: 3.9.0 → 3.9.1](PyCQA/flake8@3.9.0...3.9.1)

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

.pre-commit-config.yaml

@@ -47,7 +47,7 @@ repos:
           - --min-py3-version
           - "3.4"
   - repo: https://github.com/PyCQA/flake8
-    rev: 3.9.0
+    rev: 3.9.1
     hooks:
       - id: flake8
         additional_dependencies: