ext/ripper/lib/ripper/lexer.rb: Do not deprecate Ripper::Lexer::State#[] #5219
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The old code of IRB still uses this method. The warning is noisy on
rails console.
In principle, Ruby 3.1 deprecates nothing, so let's avoid the
deprecation for the while.
I think It is not so hard to continue to maintain it as it is a trivial
shim.
#5093