Add csv as dependency to promotions gems

Since Ruby 3.4 the csv library is it's own gem

Author: tvdeyen

legacy_promotions/solidus_legacy_promotions.gemspec

@@ -23,6 +23,7 @@ Gem::Specification.new do |s|
   s.required_ruby_version = '>= 3.1.0'
   s.required_rubygems_version = '>= 1.8.23'
 
+  s.add_dependency 'csv', '~> 3.0'
   s.add_dependency 'solidus_api', s.version
   s.add_dependency 'solidus_core', s.version
   s.add_dependency 'solidus_support', '>= 0.12.0'

promotions/solidus_promotions.gemspec

@@ -24,6 +24,7 @@ Gem::Specification.new do |spec|
   files = Dir.chdir(__dir__) { `git ls-files -z`.split("\x0") }
   spec.files = files.grep_v(%r{^(spec|bin)/})
 
+  spec.add_dependency "csv", "~> 3.0"
   spec.add_dependency "importmap-rails", "~> 1.2"
   spec.add_dependency "ransack-enum", "~> 1.0"
   spec.add_dependency "solidus_core", [">= 4.0.0", "< 5"]