Log Message:
textproc/ruby-plist: update to 3.7.0

pkgsrc: correct CATEGORIES.

3.7.0 (2023-02-21)

New features and important changes:

* Allow Marshal.load to be disabled for Plist.parse_xml (#61)

Housekeeping:

* Migrate from Travis CI to GitHub Actions; add Ruby 3.1 and 3.2 to CI
  matrix (#59)