Enabled rubygems_mfa_required

Author: sue445

rspec-parameterized-table_syntax.gemspec

@@ -19,6 +19,7 @@ I was inspired by [udzura's mock](https://gist.github.com/1881139).}
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = spec.homepage
   spec.metadata["changelog_uri"] = "#{spec.homepage}/blob/main/CHANGELOG.md"
+  spec.metadata["rubygems_mfa_required"] = "true"
 
   # Specify which files should be added to the gem when it is released.
   # The `git ls-files -z` loads the files in the RubyGem that have been added into git.