Adjust the spec to also match the Ruby 3.3 behaviour

Author: pirj

spec/sanity_check_spec.rb

@@ -28,6 +28,7 @@ def with_clean_env
       expect(`bundle exec #{script} 2>&1`)
         .to match(/uninitialized constant RSpec::Support/)
         .or match(/undefined method `require_rspec_core' for RSpec::Support:Module/)
+        .or match(/undefined method `require_rspec_core' for module RSpec::Support/)
 
       expect($?.exitstatus).to eq(1)
     end