chore(deps): update dependency flake8 to v6

renovate[bot] · web-flow · commit db1425e3da6e · 2023-03-25T04:57:36.000Z
| datasource | package | from  | to    |
| ---------- | ------- | ----- | ----- |
| pypi       | flake8  | 4.0.1 | 6.0.0 |
diff --git a/requirements.txt b/requirements.txt
@@ -1,5 +1,5 @@
 black==22.3.0
-flake8==4.0.1
+flake8==6.0.0
 mypy==0.812
 pytest==7.0.1
 coverage==6.3.2
