Fix the indentation for some steps in the gemspec job

Author: dentarg

.github/workflows/test.yml

@@ -20,10 +20,10 @@ jobs:
           bundler-cache: true
           ruby-version: ruby
 
-       - name: Generate .gemspec
+      - name: Generate .gemspec
          run: bundle exec rake gem:gemspec
 
-       - name: Ensure no changes
+      - name: Ensure no changes
          run: git diff --quiet
 
   profile: