v4.0.0

What's Changed

• Cleanup polyfills code by @tagliala in #64
• Prefer require_relative for internal requires by @tagliala in #65
• Do not test Rails edge against Ruby < 3.2 by @tagliala in #66
• Test against Active Model 8.0 by @tagliala in #67
• Test against Ruby 3.4 by @tagliala in #68
• Fix license file name and add RuboCop badge by @tagliala in #69
• Fix badge link by @tagliala in #70
• Add private_constant to private constants by @tagliala in #71

Full Changelog: v3.0.0...v4.0.0