devel/gcli: update to 2.5.0

• refactor port for new build system
• libgcli is no longer shipped
• can now leverage libedit or readline
• can now depend on textproc/lowdown

Changelog: https://lists.sr.ht/~herrhotzenplotz/gcli-announce/%3CZsyLOQM5PWINzHhH@hades%3E

PR: 281138
Reported by: Nico Sonack <nsonack@herrhotzenplotz.de>