There's a merged pull request on the void-packages repository

flake8: update to 6.1.0.
https://github.com/void-linux/void-packages/pull/45589

Description:
Switch `distfiles` to GH due to upstream changes.
Ref: https://github.com/PyCQA/flake8/pull/1761

#### Testing the changes
- I tested the changes in this PR: **YES**

#### Local build testing
- I built this PR locally for my native architecture: **x86_64**

cc @paper42