x11-themes/plata-theme: Update to 0.9.6

PR: 245207
Submitted by: Hiroki Tagato <tagattie@yandex.com> (maintainer)
Relnotes: https://gitlab.com/tista500/plata-theme/-/tags/0.9.5

		https://gitlab.com/tista500/plata-theme/-/tags/0.9.6