Bump sidekiq-unique-jobs from 5.0.10 to 6.0.8 (#9801)

Bumps [sidekiq-unique-jobs](https://github.com/mhenrixon/sidekiq-unique-jobs) from 5.0.10 to 6.0.8.
- [Release notes](https://github.com/mhenrixon/sidekiq-unique-jobs/releases)
- [Changelog](https://github.com/mhenrixon/sidekiq-unique-jobs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mhenrixon/sidekiq-unique-jobs/compare/v5.0.10...v6.0.8)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Gemfile

@@ -75,7 +75,7 @@ gem 'rqrcode', '~> 0.10'
 gem 'sanitize', '~> 5.0'
 gem 'sidekiq', '~> 5.2'
 gem 'sidekiq-scheduler', '~> 3.0'
-gem 'sidekiq-unique-jobs', '~> 5.0'
+gem 'sidekiq-unique-jobs', '~> 6.0'
 gem 'sidekiq-bulk', '~>0.2.0'
 gem 'simple-navigation', '~> 4.0'
 gem 'simple_form', '~> 4.1'