Nixpkgs: postman-6.7.3 dead url

[doyougnu]

Describe the bug
Observed behavior:

➜  ~ nix-channel --list
nixos https://nixos.org/channels/nixpkgs-unstable
➜  ~ nix-env -i postman
installing 'postman-6.7.3'
these derivations will be built:
  /nix/store/2jnkg0cw4f41z3bc8zp1ps7cfn5qa4yx-postman-6.7.3.tar.gz.drv
  /nix/store/fpfzhs4hs1v86p5iwk1icgsqlpphpxyx-postman-6.7.3.drv
these paths will be fetched (2.48 MiB download, 12.68 MiB unpacked):
  /nix/store/0dddjsjvj21yy88h5yvwzvsp7ajgw5z7-curl-7.64.0-man
  /nix/store/3w97s7yxvcz8b7d24va1jagwdp229zy9-curl-7.64.0-bin
  /nix/store/7672ijapssxyrzn23w06l7lk20mn7cnn-nss-3.46
  /nix/store/bzfj40w32hkpqbza97qqf98lqgjvj15l-polkit-0.115
  /nix/store/imz0rnn43q8x2ac6w849p1841dvdr7s3-dbus-glib-0.110
  /nix/store/mjqgmzlfyhpgf6i0k16fmgchi5a4b61k-libssh2-1.9.0-dev
  /nix/store/p9mpfqvv4hpqd983w5x93c6zpgh6vsfa-mirrors-list
  /nix/store/r2krkfinvkrxig5ldvf3m0fdq0png874-curl-7.64.0-dev
  /nix/store/zhs9k6cirzik1byvzh039xsf149s4khs-gconf-3.2.6
copying path '/nix/store/7672ijapssxyrzn23w06l7lk20mn7cnn-nss-3.46' from 'https://cache.nixos.org'...
copying path '/nix/store/imz0rnn43q8x2ac6w849p1841dvdr7s3-dbus-glib-0.110' from 'https://cache.nixos.org'...
copying path '/nix/store/bzfj40w32hkpqbza97qqf98lqgjvj15l-polkit-0.115' from 'https://cache.nixos.org'...
copying path '/nix/store/p9mpfqvv4hpqd983w5x93c6zpgh6vsfa-mirrors-list' from 'https://cache.nixos.org'...
copying path '/nix/store/3w97s7yxvcz8b7d24va1jagwdp229zy9-curl-7.64.0-bin' from 'https://cache.nixos.org'...
copying path '/nix/store/0dddjsjvj21yy88h5yvwzvsp7ajgw5z7-curl-7.64.0-man' from 'https://cache.nixos.org'...
copying path '/nix/store/mjqgmzlfyhpgf6i0k16fmgchi5a4b61k-libssh2-1.9.0-dev' from 'https://cache.nixos.org'...
copying path '/nix/store/zhs9k6cirzik1byvzh039xsf149s4khs-gconf-3.2.6' from 'https://cache.nixos.org'...
copying path '/nix/store/r2krkfinvkrxig5ldvf3m0fdq0png874-curl-7.64.0-dev' from 'https://cache.nixos.org'...
building '/nix/store/2jnkg0cw4f41z3bc8zp1ps7cfn5qa4yx-postman-6.7.3.tar.gz.drv'...

trying https://dl.pstmn.io/download/version/6.7.3/linux64
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (22) The requested URL returned error: 404
error: cannot download postman-6.7.3.tar.gz from any mirror
builder for '/nix/store/2jnkg0cw4f41z3bc8zp1ps7cfn5qa4yx-postman-6.7.3.tar.gz.drv' failed with exit code 1
cannot build derivation '/nix/store/fpfzhs4hs1v86p5iwk1icgsqlpphpxyx-postman-6.7.3.drv': 1 dependencies couldn't be built
error: build of '/nix/store/fpfzhs4hs1v86p5iwk1icgsqlpphpxyx-postman-6.7.3.drv' failed

To Reproduce
Steps to reproduce the behavior:

1. nix-env -iA nixos.postman

I've shown this above on nixos-unstable I also observed this behavior on stable.

Expected behavior
postman is installed

Additional context
Looks like this is not a new issue, related and possibly duplicate: https://github.com/NixOS/nixpkgs/issues/48466

Metadata
Please run nix run nixpkgs.nix-info -c nix-info -m and paste the result.

➜  ~ nix run nixpkgs.nix-info -c nix-info -m
 - system: `"x86_64-linux"`
 - host os: `Linux 4.19.64, NixOS, 19.03.173245.fa561021eb6 (Koi)`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.2.2`
 - channels(root): `"nixos-19.03.173453.0d79decdb3b"`
 - channels(doyougnu): `""`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`

Maintainer information:

# a list of nixpkgs attributes affected by the problem
attribute: [ postman ]
# a list of nixos modules affected by the problem
module:

[xiorcale]

Is your channel up to date ? The latest version of Postman is the 7.0.7 on unstable, and everything looks fine for me.

Did you try to run: nix-channel --update before installing it ?

[doyougnu]

Ah you were spot on. I just switched to unstable and never updated. Apologies for the redundancy! Closing for obvious reasons.