Add 'Beth Long' to humans.txt (#49561)

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

YES

## What kind of change does this PR introduce?

Add new employee as part of onboarding.

## What is the current behavior?

N/A

## What is the new behavior?

N/A

## Additional context

N/A


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

## Summary by CodeRabbit

* **Documentation**
  * Added Beth Long to the team listing.

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

apps/docs/public/humans.txt

@@ -37,6 +37,7 @@ Barco Fourie
 Barry Roodt
 Beng Eu
 Benjamin Coenen
+Beth Long
 Bo Lu
 Bobbie Soedirgo
 Brad Gyger