[pre-commit.ci] pre-commit autoupdate

updates:
- https://gitlab.com/pycqa/flake8 → https://github.com/PyCQA/flake8
- [github.com/PyCQA/flake8: 3.9.2 → 4.0.1](PyCQA/flake8@3.9.2...4.0.1)
- [github.com/pre-commit/mirrors-mypy: v0.942 → v0.950](pre-commit/mirrors-mypy@v0.942...v0.950)

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -33,14 +33,14 @@ repos:
     hooks:
     - id: black
 
-  - repo: https://gitlab.com/pycqa/flake8
-    rev: 3.9.2
+  - repo: https://github.com/PyCQA/flake8
+    rev: 4.0.1
     hooks:
     - id: flake8
       additional_dependencies: [flake8-bugbear==21.3.1]
 
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v0.942
+    rev: v0.950
     hooks:
     - id: mypy
       additional_dependencies: [attrs]