Prefer `require_relative` instead of `require`

[watermelon-copilot-for-code-review[bot]]

Watermelon AI Summary

This Pull Request updates the codebase to enhance performance by swapping out the standard require method for require_relative where applicable, ensuring a faster load time and more efficient dependency management by loading third-party libraries only when necessary.

arkana is an open repo and Watermelon will serve it for free. 🍉🫶 Why not invite more people to your team?