werkzeug: mark broken (download is 404)

[ghost]

The source code for this package can no longer be downloaded, and is
not on cache.nixos.org. This means that nobody but Hydra can build
it, which is an unsafe situation.

[wegank]

Probably fetch from https://github.com/pallets/werkzeug/releases/tag/2.3.7?

[fabaff]

The source can still be pulled from PyPI.

Temporary glitch maybe?

[AndersonTorres]

Can we rely on GitHub?

[mweinelt]

❯ nix-build -A python3.pkgs.werkzeug.src --check
checking outputs of '/nix/store/sdz2i2w3s6n0129vnh8ilb6za42jsbaa-werkzeug-2.3.7.tar.gz.drv'...

trying https://files.pythonhosted.org/packages/source/w/werkzeug/werkzeug-2.3.7.tar.gz
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100  800k  100  800k    0     0  3963k      0 --:--:-- --:--:-- --:--:-- 3963k
/nix/store/ikgygq8aalbjzyd4cg98i0ikgrq2xily-werkzeug-2.3.7.tar.gz