Superseding flake8-colors - considering that deprecatedHEADmaster

From flake8 5.0.0 on, flake8 natively supports `--color` [^1],
rendering the installation of flake8-colors obsolete. (Kudos
so far for the nice work, nonetheless.)

Debian 12 (frozen and one month before release at the point of this
update) moved flake8 from 3.8.4 to 5.0.4, so I'm moving along.
(Also, no need for venv magic anymore.)

[^1] [flake8 changelog for 5.0.0](https://flake8.pycqa.org/en/latest/release-notes/5.0.0.html)

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