Improve build time by switching to bun

[fekete965]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context.

Fixes #79

Type of Change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Style/UI improvements
• Code refactoring
• Performance improvements
• Test additions/updates

How Has This Been Tested?

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Additional Notes

Add any other context about the pull request here.

[fekete965]

@lovestaco this should be the minimal change for the CI.