TEMPORARY! Demonstrate rspec-rails build failure

See rspec/rspec-dev#259 (comment)

Author: pirj

script/clone_all_rspec_repos

@@ -12,7 +12,7 @@ if is_mri; then
   clone_repo "rspec-core"
   clone_repo "rspec-expectations"
   clone_repo "rspec-mocks"
-  clone_repo "rspec-rails" "4-0-dev"
+  clone_repo "rspec-rails" "main"
   clone_repo "rspec-support"
 
   popd