v3.9.0

What's Changed

• build(deps): bump rack from 2.2.3 to 2.2.4 by @dependabot in #500
• build(deps): bump nokogiri from 1.13.4 to 1.13.8 by @dependabot in #501
• build(deps): bump terser from 4.8.0 to 4.8.1 by @dependabot in #499
• build(deps): bump rails-html-sanitizer from 1.4.2 to 1.4.3 by @dependabot in #502
• chore(deps): update dependency cssnano to v5.1.13 by @renovate in #508
• refactor: 💡 Gemfile をリファクタリングした by @nikukyugamer in #509
• refactor: 💡 不要なファイルを削除した by @nikukyugamer in #510
• style: 💄 $ bundle exec rubocop -A . を実行した by @nikukyugamer in #511
• style: 💄 さらに $ bundle exec rubocop -A . を実行した by @nikukyugamer in #512
• style: 💄 RuboCop の Style を全て修正した by @nikukyugamer in #513

Full Changelog: v3.8.0...v3.9.0