Add anwell-db and samhuan-db to the eng-sandbox owner team (#5581)

## Changes
Add @anwell-db and @samhuan-db to `team:eng-sandbox` in
`.github/OWNERTEAMS`.

This pull request and its description were written by Isaac.

Co-authored-by: Pieter Noordhuis <pieter.noordhuis@databricks.com>

Author: anwell-db

.github/OWNERTEAMS

@@ -15,4 +15,4 @@
 team:bundle     @andrewnester @anton-107 @denik @janniklasrose @pietern @shreyas-goenka
 team:platform   @simonfaltum @renaudhartert-db @hectorcast-db @parthban-db @tanmay-db @Divyansh-db @tejaskochar-db @mihaimitrea-db @chrisst @rauchy
 team:eng-apps-devex @fjakobs @Shridhad @atilafassina @keugenek @igrekun @pkosiec @MarioCadenas @pffigueiredo @ditadi @calvarjorge
-team:eng-sandbox @pietern @shuochen0311 @akshaysingla-db
+team:eng-sandbox @pietern @shuochen0311 @akshaysingla-db @anwell-db @samhuan-db