Update activesupport requirement from >= 4.2, < 7.1.4 to >= 4.2, < 7.2.1

Updates the requirements on [activesupport](https://github.com/rails/rails) to permit the latest version.
- [Release notes](https://github.com/rails/rails/releases)
- [Changelog](https://github.com/rails/rails/blob/v7.2.0/activesupport/CHANGELOG.md)
- [Commits](rails/rails@v4.2.0...v7.1.3.4)

---
updated-dependencies:
- dependency-name: activesupport
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

freight_kit.gemspec

@@ -36,7 +36,7 @@ Gem::Specification.new do |spec|
  spec.add_development_dependency('yard', '~> 0.9.28')
 
  spec.add_dependency('activemodel', '>= 4.2', '< 7.1.4')
- spec.add_dependency('activesupport', '>= 4.2', '< 7.1.4')
+ spec.add_dependency('activesupport', '>= 4.2', '< 7.2.1')
  spec.add_dependency('active_utils', '>= 3.3.1', '< 3.5.0')
  spec.add_dependency('business_time', '~> 0.13.0')
  spec.add_dependency('httparty', '~> 0.10')