Support Parser::Ruby31

Parser gem has been started development for Ruby 3.1 (edge Ruby). whitequark/parser#792 This PR supports `Parser::Ruby31`, the early adapters will be able to try edge Ruby with RuboCop. And this PR update to require Parser 3.0.1.1 or higher, which contains `Parser::Ruby31`. https://github.com/whitequark/parser/blob/master/CHANGELOG.md#v3011-2021-05-02
rubocop · May 2, 2021 · e4e461d · e4e461d
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diff --git a/changelog/new_support_ruby_3_1_parser.md b/changelog/new_support_ruby_3_1_parser.md
@@ -0,0 +1 @@
+* [#182](https://github.com/rubocop-hq/rubocop-ast/pull/182): Support `Parser::Ruby31` for Ruby 3.1 parser (experimental). ([@koic][])
diff --git a/lib/rubocop/ast/processed_source.rb b/lib/rubocop/ast/processed_source.rb
@@ -236,6 +236,9 @@ def parser_class(ruby_version)
         when 2.8, 3.0
           require 'parser/ruby30'
           Parser::Ruby30
+        when 3.1
+          require 'parser/ruby31'
+          Parser::Ruby31
         else
           raise ArgumentError,
                 "RuboCop found unknown Ruby version: #{ruby_version.inspect}"

diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
@@ -43,6 +43,10 @@
   let(:ruby_version) { 3.0 }
 end
 
+RSpec.shared_context 'ruby 3.1', :ruby31 do
+  let(:ruby_version) { 3.1 }
+end
+
 # ...
 module DefaultRubyVersion
   extend RSpec::SharedContext