misc/rubygem-octicons: Update to 19.6.0

Changes:	https://github.com/primer/octicons/releases

misc/rubygem-octicons/Makefile

 PORTNAME=	octicons
-PORTVERSION=	19.5.0
+PORTVERSION=	19.6.0
 CATEGORIES=	misc rubygems
 MASTER_SITES=	RG
 

misc/rubygem-octicons/distinfo

-TIMESTAMP = 1691070416
-SHA256 (rubygem/octicons-19.5.0.gem) = 5d86f7412264dae3059b28aaa8fd250350bb85634a546fb047805c654c83b35e
-SIZE (rubygem/octicons-19.5.0.gem) = 209920
+TIMESTAMP = 1692640086
+SHA256 (rubygem/octicons-19.6.0.gem) = 7a2eaac188e0ac8a0a4a9cc00e1c9d48de70bb1ea8e4f5d5a4f3e95a46fac35e
+SIZE (rubygem/octicons-19.6.0.gem) = 212480