chore: add Guilherme Souza to humans.txt (supabase#21782)

Author: grdsdev

apps/docs/public/humans.txt

@@ -24,6 +24,7 @@ Egor Romanov
 Fabrizio Fenoglio
 Francesco Sansalvadore
 Greg Richardson
+Guilherme Souza
 Haydn Maley
 Hieu Pham
 Inian P