Update apollo_upload_server gem to 2.1.5
What does this MR do and why?
Related issue: #423300 (comment 1531537537)
Changelog: https://github.com/jetruby/apollo_upload_server-ruby/compare/2.1.0...master
Related issue: #423300 (comment 1531537537)
Changelog: https://github.com/jetruby/apollo_upload_server-ruby/compare/2.1.0...master