x11-toolkits/rubygem-gdk3: Update to 4.2.5

Changes:	https://github.com/ruby-gnome/ruby-gnome/releases
		https://github.com/ruby-gnome/ruby-gnome/blob/main/NEWS.md

x11-toolkits/rubygem-gdk3/Makefile

 PORTNAME=	gdk3
-PORTVERSION=	4.2.4
+PORTVERSION=	4.2.5
 CATEGORIES=	x11-toolkits rubygems
 MASTER_SITES=	RG
 

x11-toolkits/rubygem-gdk3/distinfo

-TIMESTAMP = 1727315464
-SHA256 (rubygem/gdk3-4.2.4.gem) = 0666ca56fac9e4387c37093e094f12d0331477a4ced016595c772ceb6c726f46
-SIZE (rubygem/gdk3-4.2.4.gem) = 35840
+TIMESTAMP = 1735228216
+SHA256 (rubygem/gdk3-4.2.5.gem) = bae833d84539d9497d6b5152ec7fd784f9b0ef9c3573ee37a48970f16cc777c8
+SIZE (rubygem/gdk3-4.2.5.gem) = 35840