Automatically use the latest Ruby for CI

Author: ksss

.github/workflows/generate_comment_body_on_review.yml

@@ -29,7 +29,7 @@ jobs:
           ref: main
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.3'
+          ruby-version: ruby
           bundler-cache: false
       - name: Changed gems and non gem files
         id: changes

.github/workflows/merge_on_comment.yml

@@ -35,7 +35,7 @@ jobs:
           ref: main
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.3'
+          ruby-version: ruby
           bundler-cache: false
       - name: Fetch PR information
         id: pr_info

.github/workflows/rubocop.yml

@@ -14,7 +14,7 @@ jobs:
     - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
       with:
-        ruby-version: '3.3'
+        ruby-version: ruby
         bundler-cache: true
     - name: 'Install dependencies'
       run: 'bundle install'

.github/workflows/test.yml

@@ -17,7 +17,7 @@ jobs:
     - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
       with:
-        ruby-version: '3.3'
+        ruby-version: ruby
         bundler-cache: true
     - name: 'Install dependencies'
       run: 'gem install rbs'
@@ -32,7 +32,7 @@ jobs:
     - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
       with:
-        ruby-version: '3.3'
+        ruby-version: ruby
         bundler-cache: true
     - name: Run bin/setup
       run: bin/setup
@@ -64,7 +64,7 @@ jobs:
     - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
       with:
-        ruby-version: '3.3'
+        ruby-version: ruby
         bundler-cache: true
     - name: Run bin/setup
       run: bin/setup
@@ -77,7 +77,7 @@ jobs:
     - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@v1
       with:
-        ruby-version: '3.3'
+        ruby-version: ruby
         bundler-cache: true
     - name: Check .rubocop.yml
       run: ruby .github/workflows/pr_bot/strict_rubocop_config.rb

.github/workflows/welcome_comment.yml

@@ -27,7 +27,7 @@ jobs:
           ref: main
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.3'
+          ruby-version: ruby
           bundler-cache: false
       - name: Changed gems and non gem files
         id: changes