dep(dev): pin psych to v4 until v5 builds in CI

see ruby/setup-ruby#409
sparklemotion · Dec 6, 2022 · 6a3254c · 6a3254c
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diff --git a/Gemfile b/Gemfile
@@ -16,6 +16,7 @@ group :development do
   # documentation
   gem "hoe-markdown", "= 1.4.0"
   gem "rdoc", "= 6.4.0"
+  gem "psych", "~> 4.0" # psych 5 isn't building in places yet https://github.com/ruby/setup-ruby/issues/409
 
   # parser generator
   gem "rexical", "= 1.0.7"