Aligns ruby version with other gems.

- min version is now: 3.0
- add 3.3 to CI

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.2'
+          ruby-version: '3.3'
           bundler-cache: true
       - name: Run rubocop
         run: bundle exec rubocop --parallel --format progress
@@ -28,7 +28,7 @@ jobs:
     needs: ['rubocop']
     strategy:
       matrix:
-        ruby-version: ['3.0', '3.1', '3.2', 'head']
+        ruby-version: ['3.0', '3.1', '3.2', '3.3', 'head']
     steps:
     - name: Check out branch
       uses: actions/checkout@v4

grape-entity.gemspec

@@ -14,7 +14,7 @@ Gem::Specification.new do |s|
   s.description = 'Extracted from Grape, A Ruby framework for rapid API development with great conventions.'
   s.license     = 'MIT'
 
-  s.required_ruby_version = '>= 2.7'
+  s.required_ruby_version = '>= 3.0'
 
   s.add_runtime_dependency 'activesupport', '>= 3.0.0'
   # FIXME: remove dependecy