devel/rubygem-i18n: fix frozen string

With version v1.13.0 code was changed that returns a frozen string.
This breaks e.g. gitlab-ce on some pages.
Geoffrey Mainland ([email protected]) pointed to the issue
logged upstream:
ruby-i18n/i18n#658

PR:		271420
PR:		271356
Approved by:	sunpoet (maintainer)

Author: mfechner

devel/rubygem-i18n/Makefile

@@ -1,5 +1,6 @@
 PORTNAME=	i18n
 PORTVERSION=	1.14.0
+PORTREVISION=	1
 PORTEPOCH=	2
 CATEGORIES=	devel rubygems
 MASTER_SITES=	RG

devel/rubygem-i18n/files/patch-bug-271420

@@ -0,0 +1,11 @@
+--- lib/i18n/interpolate/ruby.rb.orig	2023-06-02 05:26:32 UTC
++++ lib/i18n/interpolate/ruby.rb
+@@ -47,7 +47,7 @@ module I18n
+         end
+       end
+ 
+-      interpolated ? interpolated_string : string
++      interpolated ? interpolated_string : string.dup
+     end
+   end
+ end