Pin rdoc to < 6.4

rdoc 6.4 pulls in psych 4 and Puppet is incompatible with that. We don't want to list psych since that updates the bundled version
ekohl · Jan 7, 2022 · 72c2858 · 72c2858
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commit 72c2858
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diff --git a/Gemfile b/Gemfile
@@ -1,5 +1,9 @@
 source 'https://rubygems.org'
 
+# rdoc 6.4 pulls in psych 4 and Puppet is incompatible with that.
+# We don't want to list psych since that updates the bundled version
+gem 'rdoc', '< 6.4'
+
 gem 'kafo', '~> 6.4'
 gem 'librarian-puppet', '>= 3.0'
 gem 'puppet', ENV.key?('PUPPET_VERSION') ? "~> #{ENV['PUPPET_VERSION']}" : '~> 7.0'