Gemfile: add racc to development, lint group

In Ruby 3.3, this is not a stdlib.
lostisland · Dec 14, 2023 · 639e1b5 · 639e1b5
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commit 639e1b5
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diff --git a/Gemfile b/Gemfile
@@ -19,6 +19,7 @@ group :development, :test do
 end
 
 group :development, :lint do
+  gem 'racc', '~> 1.7' # for RuboCop, on Ruby 3.3
   gem 'rubocop'
   gem 'rubocop-packaging', '~> 0.5'
   gem 'rubocop-performance', '~> 1.0'