Update activerecord requirement from >= 7.0, < 7.3 to >= 7.0, < 8.1 (#37

)

Updates the requirements on [activerecord](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/v8.0.0/activerecord/CHANGELOG.md)
- [Commits](rails/rails@v7.0.0...v7.2.2)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

paranoia_uniqueness_validator.gemspec

@@ -18,7 +18,7 @@ Gem::Specification.new do |gem|
   gem.require_paths = ['lib']
   gem.required_ruby_version = '>= 3.1'
 
-  gem.add_dependency 'activerecord', '>= 7.0', '< 7.3'
+  gem.add_dependency 'activerecord', '>= 7.0', '< 8.1'
 
   gem.add_development_dependency 'database_cleaner', '~> 2.0'
   gem.add_development_dependency 'paranoia', '~> 3.0'