Update spring gem dependency to 2.x
|Assigned To:||Dominic Cleal|
|Found in release:||Pull request:||https://github.com/theforeman/foreman/pull/4430|
|Velocity based estimate||-|
The spring gem is pinned to 1.x, but this can be updated safely to 2.x (which dropped Rails 4.0 and 4.1 support) to receive bug fixes.