Fix broken authentication documentation link

[Copilot]

The authentication documentation link in action.yml was pointing to a non-existent URL.

Changes

• Updated auth-host input description link from https://prefix.dev/docs/pixi/authentication to https://pixi.prefix.dev/latest/deployment/authentication/

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• pixi.prefix.dev
  • Triggering command: /usr/bin/curl curl -I -L -s -o /dev/null -w %{http_code} REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>The link "https://prefix.dev/docs/pixi/authentication" mentioned In actions.yml is broken</issue_title>
<issue_description>The following link seems to be broken:

setup-pixi/action.yml

Line 66 in f1fb10f

See https://prefix.dev/docs/pixi/authentication

</issue_description>

Comments on the Issue (you are @copilot in this section)

@pavelzw It should be https://pixi.prefix.dev/latest/deployment/authentication/

• Fixes The link "https://prefix.dev/docs/pixi/authentication" mentioned In actions.yml is broken #251

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