sysutils/macchina: update to 0.8.1

0.8.1
=====
-Added the ability to list available and custom themes through --list-themes
flag
-Merged a PR by @uttarayan21 that adds more targets for our CI checks and
releases

0.8.0
=====
-Merged a PR by @uttarayan21 that adds support for configuring macchina
through a dotfile.
-The same PR also adds support for using custom themes that allow you
to customize macchina the way you like instead of using the built-in themes
we provide.

(pin)