Fix deprecated interface for YAML.safe_load #781
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Passing in the permitted classes as the second argument was deprecated in Psych 3 (ruby/psych#378) and removed in Psych 4 (ruby/psych#487).
Ruby 3.1 ships with Psych 4, so to make the code work for Ruby 2.7 and up, use the
permitted_classes
keyword argument.