[DRE-maint] Bug#1035307: Update ruby-ruby-parser to 3.20.x

[Praveen Arimbrathodiyil]

On 04/05/23 10:44 pm, Pirate Praveen wrote:
> Running the tests like upstream would with ruby 3.1 installed via rvm, 
> the same errors are reproduced.
> 
> https://github.com/seattlerb/ruby_parser/issues/337#issuecomment-1535023385
> 

on bullseye with rvm installed ruby 3.0, all tests pass. Though on sid, 
rvm install 3.0 fails.
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