Restore NPM Cache v2.3.1

[system]

What’s Changed

• Bump steputil for better download speeds by @lpusok in Bump steputil for better download speeds by lpusok · Pull Request #11 · bitrise-steplib/bitrise-step-restore-npm-cache · GitHub

Full Changelog: Comparing 2.3.0...2.3.1 · bitrise-steplib/bitrise-step-restore-npm-cache · GitHub

Release 2.3.1 · bitrise-steplib/bitrise-step-restore-npm-cache