Investigate Bundler 2.5.12 failures

[KaanOzkan]

Limiting the bundler version isn't a long term solution.

CI: https://github.com/Shopify/tapioca/actions/runs/9519041069 Was able to reproduce one test locally: bin/test spec/tapioca/cli/gem_spec.rb:706 for https://github.com/Shopify/tapioca/blob/a983c8456771bdb1bbbf860202fad63b63387308/spec/tapioca/cli/gem_spec.rb#L706

Edit: Still happening on 2.5.15: https://github.com/Shopify/tapioca/actions/runs/9958874529