x11/ghostty: Update 1.2.0 => 1.3.1, undeprecate (fix build)

While here, unbundle libraries: freetype, spirv-cross.

Release notes:
https://ghostty.org/docs/install/release-notes

Changelog:
https://github.com/ghostty-org/ghostty/compare/v1.2.0...v1.3.1

PR: 292482
Reviewed by: diizzy, osa (mentor), vvd (mentor)
Approved by: charlesrocket <slowdive@me.com> (maintainer, timeout >1 month)
Approved by: vvd (mentor)
Co-authored-by: Vladimir Druzenko <vvd@FreeBSD.org>
MFH: 2026Q1
Differential Revision: https://reviews.freebsd.org/D55762