gnucash stable: Add new Arch package gwenhywfar-gtk3 to Dockerfile.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/9f8f4d9e (commit)
	from  https://github.com/Gnucash/gnucash/commit/ea67f3a8 (commit)



commit 9f8f4d9ed3a44d548fdbe361a087b73508663378
Author: John Ralls <jralls at ceridwen.us>
Date:   Mon Apr 13 16:57:57 2026 -0700

    Add new Arch package gwenhywfar-gtk3 to Dockerfile.
    
    Fixes broken build. gwengui-gtk3 used to be included in the
    gwenhywfar package.



Summary of changes:
 util/ci/actions/archlinux-test/Dockerfile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)