audio/go-librespot: Update 0.7.1 => 0.9.0

While here, sort LIB_DEPENDS (pet portfmt).

Changelogs:

• https://github.com/devgianlu/go-librespot/releases/tag/v0.7.2
• https://github.com/devgianlu/go-librespot/releases/tag/v0.7.3
• https://github.com/devgianlu/go-librespot/releases/tag/v0.7.4
• https://github.com/devgianlu/go-librespot/releases/tag/v0.8.0
• https://github.com/devgianlu/go-librespot/releases/tag/v0.9.0

PR: 298179
Reported by: Alexandre Biancalana <ale@biancalanas.net> (maintainer)
Approved by: osa, vvd (Mentors, implicit)
MFH: 2026Q3

(cherry picked from commit ee6c2f31124efc05d085f8e5b434b05cc15e00a2)