Add Stephen Denham to humans.txt (#51025)

## Problem

My name is not in humans.txt and I am a human at Supabase!

## Solution

Add my name to humans.txt

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## Checklist

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- [X] I have read
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<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Documentation**
* The team listing has been updated to include Stephen Denham. This
change is visible in the published team information; no other updates
are included in this release.

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

apps/docs/public/humans.txt

@@ -302,6 +302,7 @@ Shreekar Shetty
 Simon Tomlinson
 Sreyas Udayavarman
 Stephanie Jackson (stejacks)
+Stephen Denham
 Stephen Morgan
 Steve Chavez
 Steven Eubank