security/rubygem-bcrypt: Update to 3.1.18

Changes:	https://github.com/bcrypt-ruby/bcrypt-ruby/releases
		https://github.com/bcrypt-ruby/bcrypt-ruby/blob/master/CHANGELOG

security/rubygem-bcrypt/Makefile

 # Created by: Steve Wills <swills@FreeBSD.org>
 
 PORTNAME=	bcrypt
-PORTVERSION=	3.1.17
+PORTVERSION=	3.1.18
 CATEGORIES=	security rubygems
 MASTER_SITES=	RG
 

security/rubygem-bcrypt/distinfo

-TIMESTAMP = 1648249206
-SHA256 (rubygem/bcrypt-3.1.17.gem) = c53876c0fdd9604a0c0927a8f7f79cd21dd8f88d29c2a88fbf99326a336c53e5
-SIZE (rubygem/bcrypt-3.1.17.gem) = 55808
+TIMESTAMP = 1653151286
+SHA256 (rubygem/bcrypt-3.1.18.gem) = 154de0b0b089e56d5980c5037ad85fc9554cfbf4996538673c1ddbc9b61b1f11
+SIZE (rubygem/bcrypt-3.1.18.gem) = 55808