Fix failing CI job "matrix / test (ruby:2.4, rails-4.2)" by correcting i18n version pin

[Copilot]

The CI job matrix / test (ruby:2.4, rails-4.2) was failing due to a bundle update dependency resolution error introduced by a recent change that pinned i18n to version 1.14.8 for all Rails versions on Ruby < 3.2.

Root Cause

Commit d7f24f0 added gem 'i18n', '1.14.8' to fix a runtime error with i18n 1.15.0 (which uses Fiber[] requiring Ruby 3.2+ but incorrectly declares required_ruby_version >= 3.1). However, the condition was too broad: Rails 4.2 requires i18n ~> 0.7 (< 1.0), which is directly incompatible with the 1.14.8 pin, causing Bundler to fail with unresolvable dependency conflicts.

Fix

Narrowed the i18n pin condition in the Gemfile to only apply when the Rails version is >= 5.2, since Rails 5.2+ supports i18n >= 0.7, < 2 (and therefore accepts 1.14.8), while Rails 4.x requires i18n ~> 0.7 (< 1.0).

# Before
if framework == 'rails' && RUBY_VERSION < '3.2' && !defined?(JRUBY_VERSION)
  gem 'i18n', '1.14.8'
end

# After
if framework == 'rails' && RUBY_VERSION < '3.2' && !defined?(JRUBY_VERSION) && version >= '5.2'
  gem 'i18n', '1.14.8'
end

[hegerchr]

LGTM