Fix spec failure on ruby 3.1

Because https://github.com/ruby/ruby/pull/5148 merged after Ruby 3.1.0 released.

13241b71a5 did not fix proc spec yet.

https://github.com/ruby/actions/runs/4718820699?check_suite_focus=true#step:18:173
```
  1)
  Proc#parameters adds * rest arg for "star" argument FAILED
  Expected [[:req, :x], [:rest]] == [[:req, :x], [:rest, :*]]
  to be truthy but was false
  /home/runner/work/actions/actions/snapshot-ruby_3_1/spec/ruby/core/proc/parameters_spec.rb:85:in `block (3 levels) in <top (required)>'
  /home/runner/work/actions/actions/snapshot-ruby_3_1/spec/ruby/core/proc/parameters_spec.rb:3:in `<top (required)>'
```

spec/ruby/core/proc/parameters_spec.rb

@@ -80,13 +80,13 @@ describe "Proc#parameters" do
     -> x {}.parameters.should == [[:req, :x]]
   end
 
-  ruby_version_is '3.1' do
+  ruby_version_is '3.2' do
     it "adds * rest arg for \"star\" argument" do
       -> x, * {}.parameters.should == [[:req, :x], [:rest, :*]]
     end
   end
 
-  ruby_version_is ''...'3.1' do
+  ruby_version_is ''...'3.2' do
     it "adds nameless rest arg for \"star\" argument" do
       -> x, * {}.parameters.should == [[:req, :x], [:rest]]
     end