devel/rubygem-excon: Update to 0.91.0

Changes:	https://github.com/excon/excon/blob/master/changelog.txt

devel/rubygem-excon/Makefile

 # Created by: Steve Wills <swills@FreeBSD.org>
 
 PORTNAME=	excon
-PORTVERSION=	0.90.0
+PORTVERSION=	0.91.0
 CATEGORIES=	devel rubygems
 MASTER_SITES=	RG
 

devel/rubygem-excon/distinfo

-TIMESTAMP = 1642102607
-SHA256 (rubygem/excon-0.90.0.gem) = 01beac0f20652b12de95aef931f72bcb82ffb009e1c34c42a5cf5df93f4070ae
-SIZE (rubygem/excon-0.90.0.gem) = 160256
+TIMESTAMP = 1646058788
+SHA256 (rubygem/excon-0.91.0.gem) = e47408ada7784a8eea4faa3b779127c609cb1fb024b6da12bc6cadf02dc8210d
+SIZE (rubygem/excon-0.91.0.gem) = 163328