Speed improvements, Swift package manager and more

* Add Swift Package Manager action (#11405) via Flávio Caetano
* Require fixes and optimizations (#11244) via Manu Wallner
* Enable cancelling of running lanes (#11419) via Joshua Liebowitz
* Add `FASTLANE_DISABLE_ANIMATION` to disable loading indicators across fastlane (#11447) via Felix Krause
* fix require pathname for older ruby versions (#11466) via Helmut Januschka
* Improve fastlane Fastfile (#11455) via Jan Piotrowski
* [snapshot] Add test-without-building capability (#11404) via igor-makarov
* deliver: work-around ruby 2.5.0 ERB compatibility (fixes #11395) (#11436) via Jerome Lacoste

https://github.com/fastlane/fastlane/releases/tag/2.74.0
