devel/rubygem-active_scaffold: Update to 3.6.15

Changes:	https://github.com/activescaffold/active_scaffold/blob/master/CHANGELOG.rdoc

devel/rubygem-active_scaffold/Makefile

 PORTNAME=	active_scaffold
-PORTVERSION=	3.6.14
+PORTVERSION=	3.6.15
 CATEGORIES=	devel rubygems
 MASTER_SITES=	RG
 

devel/rubygem-active_scaffold/distinfo

-TIMESTAMP = 1669058353
-SHA256 (rubygem/active_scaffold-3.6.14.gem) = dcf9b94eaedafcbf4b6ae9b1148d4fc4a28f2396fd5071a7473e2272c6933153
-SIZE (rubygem/active_scaffold-3.6.14.gem) = 307200
+TIMESTAMP = 1674590840
+SHA256 (rubygem/active_scaffold-3.6.15.gem) = 79bac63e493c84297cfc65d9a7b7a07d93d80b86b68f83b56111f8ae0ef18ce9
+SIZE (rubygem/active_scaffold-3.6.15.gem) = 307200