Add Tomohiro Mitani to humans.txt (#49882)

## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES/NO

## What kind of change does this PR introduce?

Bug fix, feature, docs update, ...

## What is the current behavior?

Please link any relevant issues here.

## What is the new behavior?

Feel free to include screenshots if it includes visual changes.

## Additional context

Add any other context or screenshots.


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Documentation**
  * Added Tomohiro Mitani to the project’s team listing.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

apps/docs/public/humans.txt

@@ -313,6 +313,7 @@ Tom Ashley
 Tom G
 Tomás Pozo
 Tomás Torgal
+Tomohiro Mitani
 Tyler Hillery
 Tyler Fontaine
 Tyler Shukert