devel/ruby-regexp_parser: update to 2.2.1

2.2.1 (2022-02-11)

Fixed

* fixed Syntax version of absence groups ((?~...))
  - the lexer accepted them for any Ruby version
  - now they are only recognized for Ruby >= 2.4.1 in which they were
    introduced
* reduced gem size by excluding specs from package
* removed deprecated test_files gemspec setting
* no longer depend on yaml/psych (except for Ruby <= 2.4)
* no longer depend on set
  - set was removed from the stdlib and made a standalone gem as of Ruby 3
  - this made it a hidden/undeclared dependency of regexp_parser

(taca)