net/rubygem-google-cloud-storage: Update to 1.31.0

Changes:	https://github.com/googleapis/google-cloud-ruby/releases
		https://github.com/googleapis/google-cloud-ruby/blob/master/google-cloud-storage/CHANGELOG.md

net/rubygem-google-cloud-storage/Makefile

 # Created by: Po-Chuan Hsieh <sunpoet@FreeBSD.org>
 
 PORTNAME=	google-cloud-storage
-PORTVERSION=	1.30.0
+PORTVERSION=	1.31.0
 CATEGORIES=	net rubygems
 MASTER_SITES=	RG
 

net/rubygem-google-cloud-storage/distinfo

-TIMESTAMP = 1611665653
-SHA256 (rubygem/google-cloud-storage-1.30.0.gem) = d5584f3c046997e48e0cd3f0c11a76eee35d0be734841d0022e0015f5f895d9d
-SIZE (rubygem/google-cloud-storage-1.30.0.gem) = 96256
+TIMESTAMP = 1618321000
+SHA256 (rubygem/google-cloud-storage-1.31.0.gem) = 1a99b706a455e6b3e91e1dda24271068b23af0bc58f6049ee05b9318b5e553ae
+SIZE (rubygem/google-cloud-storage-1.31.0.gem) = 96256