fix version

Author: dzencot

.github/workflows/main.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Set up Ruby 3.0
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.0.x
+          ruby-version: 3.0.0
 
       - name: Install dependencies
         run: make install