Merge pull request #349 from ruby-formatter/fix-ci-20251013

Update simplecov-cobertura for fix CI error

Author: kzkn

Gemfile

@@ -12,4 +12,4 @@ gem "rspec", "~> 3.0"
 gem "rspec_junit_formatter", "~> 0.6.0"
 gem "rubocop", "~> 1.69.2"
 gem "simplecov", "~> 0.22.0"
-gem "simplecov-cobertura", "~> 2.1"
+gem "simplecov-cobertura", "~> 3.1"