Daniil Antoshin

After rack upgrades to 3.0, Rack::Handler moved to separate gem https://github.com/rack/rack/blob/main/UPGRADE-GUIDE.md#binrackup-rackserver-rackhandlerand--racklobster-were-moved-to-a-separate-gem Possible solution: ```ruby server = defined?(Rackup::Handler) ? Rackup::Handler : Rack::Handler server.run Kubernetes::Health::RackOnSidekiq.new, Port: Kubernetes::Health::Config.metrics_port ```

(feat): add Faraday proxy support

3

## Summary Adding the ability to use a proxy when proxy from ENV is not suitable. ```ruby proxy = { :uri => 'http://proxy.example.com', :user => 'foo', :password => 'bar' }...