Ignore parseing specific files on TruffleRuby to make CI green

CI is currently failing due to an issue with Ripper on the latest
TruffleRuby version. This commit removes the offending tests from
running, to ensure CI is green again.

Author: jemmaissroff

test/yarp/parse_test.rb

@@ -58,6 +58,9 @@ def test_parse_lex_file
       # These fail on TruffleRuby due to a difference in Symbol#inspect: :测试 vs :"测试"
       next if RUBY_ENGINE == "truffleruby" and %w[seattlerb/bug202.txt seattlerb/magic_encoding_comment.txt].include?(relative)
 
+      # These fail on TruffleRuby due to a Ripper difference
+      next if RUBY_ENGINE == "truffleruby" and %w[symbols.txt unparser/corpus/literal/def.txt].include?(relative)
+
       filepath = File.join(base, relative)
       snapshot = File.expand_path(File.join("snapshots", relative), __dir__)