Support Ruby 4.1

Prism 1.7 adds support for `Prism::Translation::Parser41`.
https://github.com/ruby/prism/releases/tag/v1.7.0

Ruby 4.1 development hasn't started yet, but it should be fine to start
depending on Prism's published API as Ruby's parser.

Author: koic

changelog/new_support_ruby_4_1.md

@@ -0,0 +1 @@
+- [#394](https://github.com/rubocop/rubocop-ast/pull/394): Support Ruby 4.1 (experimental). ([@koic][])

lib/rubocop/ast/processed_source.rb

@@ -314,11 +314,9 @@ def parser_class(ruby_version, parser_engine)
           when 3.4
             Prism::Translation::Parser34
           when 3.5, 4.0
-            # TODO: The meaning of the version numbers in `Parser35` (Ruby 3.5) is the same as in
-            # `Parser40` (Ruby 4.0). Once the next version of Prism 1.6.0 is released,
-            # `Parser35` should probably be replaced with `Parser40`:
-            # See: https://github.com/ruby/prism/pull/3709
-            Prism::Translation::Parser35
+            Prism::Translation::Parser40
+          when 4.1
+            Prism::Translation::Parser41
           else
             raise ArgumentError, 'RuboCop supports target Ruby versions 3.3 and above with Prism. ' \
                                  "Specified target Ruby version: #{ruby_version.inspect}"

rubocop-ast.gemspec

@@ -34,7 +34,7 @@ Gem::Specification.new do |s|
   }
 
   s.add_dependency('parser', '>= 3.3.7.2')
-  s.add_dependency('prism', '~> 1.4')
+  s.add_dependency('prism', '~> 1.7')
 
   ##### Do NOT add `rubocop` (or anything depending on `rubocop`) here. See Gemfile
 end

spec/spec_helper.rb

@@ -71,6 +71,11 @@
   let(:ruby_version) { ENV['PARSER_ENGINE'] == 'parser_prism' ? 4.0 : 3.3 }
 end
 
+RSpec.shared_context 'ruby 4.1', :ruby41 do
+  # Parser supports parsing Ruby <= 3.3.
+  let(:ruby_version) { ENV['PARSER_ENGINE'] == 'parser_prism' ? 4.1 : 3.3 }
+end
+
 # ...
 module DefaultRubyVersion
   extend RSpec::SharedContext