Centralize Ruby Version to .ruby-version (#1830)

* Remove TargetRubyVersion in rubocop config

As it reads from required_ruby_version in the gemspec

* Remove ruby version definitions in GH Actions workflows

As it reads from .ruby-version

.github/workflows/ci.yml

@@ -13,7 +13,6 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "3.3"
           bundler-cache: true
 
       - name: Check if documentation is up to date
@@ -86,8 +85,6 @@ jobs:
       # We need some Ruby installed for the environment activation tests
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: "3.3.0"
 
       - name: Download shadowenv
         if: matrix.os == 'ubuntu-latest' || matrix.os == 'macos-latest'

.github/workflows/lsp_check.yml

@@ -12,7 +12,6 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "3.2"
           bundler-cache: true
 
       - name: Run ruby-lsp-check

.github/workflows/version_bump.yml

@@ -22,7 +22,6 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.3.0
           bundler-cache: true
           cache-version: 1
 

.rubocop.yml

@@ -11,7 +11,6 @@ require:
 AllCops:
   NewCops: disable
   SuggestExtensions: false
-  TargetRubyVersion: 3.0
   Include:
     - "sorbet/rbi/shims/**/*.rbi"
   Exclude: