fix: use exact Ruby 3.0.0 version in CI to match gemspec requirement

Author: nicolaiarocci

.github/workflows/release.yml

@@ -33,7 +33,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.0'
+          ruby-version: '3.0.0'
           bundler-cache: true
 
       - name: Build gem