Update I18n to 1.12 (#37401).

git-svn-id: https://svn.redmine.org/redmine/trunk@21704 e93f8b46-1217-0410-a6f0-8f06a7374b81

Gemfile

@@ -14,7 +14,7 @@ gem "mail", "~> 2.7.1"
 gem 'csv', '~> 3.2.0'
 gem 'nokogiri', '~> 1.13.6'
 gem "rexml", require: false if Gem.ruby_version >= Gem::Version.new('3.0')
-gem 'i18n', '~> 1.11.0'
+gem 'i18n', '~> 1.12.0'
 gem "rbpdf", "~> 1.20.0"
 gem 'addressable'
 gem 'rubyzip', '~> 2.3.0'