Fix TWiN script

[rgwood]

At some point this broke, just committing a fix I've had on my personal computer for a while.

# This week in Nushell #261


## Nushell

Error: nu::shell::name_not_found

  × Name not found
    ╭─[/home/reilly/github/nu_scripts/make_release/this_week_in_nu_weekly.nu:36:48]
 35 │
 36 │             for user in ($site_json | group-by user_login | transpose user prs) {
    ·                                                ─────┬────
    ·                                                     ╰── did you mean 'user.login'?
 37 │                 let user_name = $user.user
    ╰────

[rgwood]

Not sure about the failing check, I didn't change that line 🤔 Guessing that's just alerting on some old code in the file that can be cleaned up.

[fdncred]

The ci isn't very reliable. thanks.