Tentatively ignore errors on TruffleRuby head

[nobu]

TruffleRuby changed somewhere between f403dd53..315e774d.

$ truffleruby -v -e 'def parseable?(code);eval("BEGIN {return true}\n#{code}");rescue SyntaxError; false; end' -e 'p parseable?("")'
truffleruby 23.1.0-dev-b64cd1d4, like ruby 3.1.3, GraalVM CE Native [x86_64-darwin]
(eval):1:in `parseable?': unexpected return (LocalJumpError)
	from -e:1:in `parseable?'
	from -e:2:in `<main>'