docs: update upstream url in CONTRIBUTING.md

[kstonekuan]

Update the upstream url in CONTRIBUTING.md to the correct one.

For your approval @juecd

[mesa-dot-dev]

Mesa Description

TL;DR

Updated the upstream URL in CONTRIBUTING.md to the correct repository.

Why we made these changes

The previous URL was incorrect, which could hinder new contributors trying to set up their remote repositories.

What changed?

• CONTRIBUTING.md: Corrected the upstream remote repository URL from original/kernel-images.git to onkernel/kernel-images.git.

[mesa-dot-dev]

What Changed

This PR updates the CONTRIBUTING.md file to correct the upstream repository URL. The URL was changed from original/kernel-images to onkernel/kernel-images, ensuring that contributors have the correct information for setting up their development environment.

Risks / Concerns

This is a straightforward and helpful documentation update with no foreseeable risks. Thanks for keeping our contributing guide accurate!

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[juecd]

Appreciate your help!

[kstonekuan]

Thanks for approving!

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