gnucash-on-windows master: Update Gwenhywfar to 5.12,2

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash-on-windows/commit/5e9c1860 (commit)
	from  https://github.com/Gnucash/gnucash-on-windows/commit/aca421b2 (commit)



commit 5e9c1860c306510b2fcd8508be3564ff0ccba915
Author: John Ralls <jralls at ceridwen.us>
Date:   Tue Sep 16 10:10:40 2025 -0700

    Update Gwenhywfar to 5.12,2



Summary of changes:
 gnucash.modules | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)