The development tools should be aligned between Flake.nix and pre-commit

[hillairet]

Right now the local setup can be in an annoying situation where the versions of a tool like Black differ between the Nix environment and pre-commit.

The version is pinned in pre-commit (and not to the latest one):

scaf/.pre-commit-config.yaml

Line 13 in 78bf22d

rev: 23.9.1

But it's not pinned in Nix therefore it can (and currently is) different:

scaf/flake.nix

Line 22 in 78bf22d

pkgs.python3.pkgs.black

Ideally, there would be some consistency check or simply the version in Nix should be pinned if possible.

[hillairet]

Assigning to you @sedatbasar for visibility.