Update mongoid-locker requirement from ~> 1.0 to ~> 2.0 (#1592)

Updates the requirements on [mongoid-locker](https://github.com/mongoid/mongoid-locker) to permit the latest version.
- [Release notes](https://github.com/mongoid/mongoid-locker/releases)
- [Changelog](https://github.com/mongoid/mongoid-locker/blob/master/CHANGELOG.md)
- [Commits](mongoid/mongoid-locker@v1.0.0...v2.0.2)

---
updated-dependencies:
- dependency-name: mongoid-locker
  dependency-type: direct:development
...

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

Gemfile

@@ -68,7 +68,7 @@ if ENV['MONGOID_VERSION']
     gem 'mongoid', '>= 5'
   end
 
-  gem 'mongoid-locker', '~> 1.0'
+  gem 'mongoid-locker', '~> 2.0'
 end
 
 gem "rails", "~> 7"

devise_token_auth.gemspec

@@ -31,5 +31,5 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'pg'
   s.add_development_dependency 'mysql2'
   s.add_development_dependency 'mongoid', '>= 4', '< 8'
-  s.add_development_dependency 'mongoid-locker', '~> 1.0'
+  s.add_development_dependency 'mongoid-locker', '~> 2.0'
 end