Log Message:
devel/ruby-highline: update to 2.1.0

Required by new version of ruby-squib.

2.1.0 (2022-12-31)

* PR #255 - Change minimum Ruby version requirement to 2.3 (@abinoam)
* PR #254 - Improve Github Actions file (@abinoam)
* PR #253, PR #251 - Setup GitHub Actions and remove Travis
  (@petergoldstein, rev by @AlexWayfer)
* PR #250 - Fix file permissions (@bdunne)