Fix RegExp warning causing flaky Ripper failure
Sometimes this file get picked up and break Ripper tests:
TestRipper::Generic#test_parse_files:test/ruby assert_separately failed with error message pid 63392 exit 0 | test_regexp.rb:2025: warning: character class has duplicated range
https://github.com/ruby/ruby/actions/runs/7699956651/job/20982702553#step:12:103
Fix RegExp warning causing flaky Ripper failure
Sometimes this file get picked up and break Ripper tests:
https://github.com/ruby/ruby/actions/runs/7699956651/job/20982702553#step:12:103