Pin `rbush` version for use in Commonjs

[jjspace]

Description

rbush v4 updated to only support ES modules but CesiumJS supports ESM and Common JS which means downstream builds using Cesium JS don't work. This pins the version to 3.0.1 which is the one before 4.0

Issue number and link

Addresses the error in #12191

Testing plan

• Run npm install to make sure you have the pinned version of rbush
• Make sure CI and tests pass
• Make sure the RectangleCollisionChecker still works as expected. This is used in clustering, make sure that sandcastle works

Author checklist

• [ ] I have submitted a Contributor License Agreement
• [ ] I have added my name to CONTRIBUTORS.md
• [ ] I have updated CHANGES.md with a short summary of my change
• [ ] I have added or updated unit tests to ensure consistent code coverage
• [ ] I have updated the inline documentation, and included code examples where relevant
• [ ] I have performed a self-review of my code

[github-actions[bot]]

Thank you for the pull request, @jjspace!

:white_check_mark: We can confirm we have a CLA on file for you.