Update Xtansia's maintainership affiliation (#1807) (#1808)

(cherry picked from commit b27ce6b)

Signed-off-by: Thomas Farr <xtansia@xtansia.com>
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: opensearch-trigger-bot[bot]

MAINTAINERS.md

@@ -12,7 +12,7 @@ This document contains a list of maintainers in this repo. See [opensearch-proje
 | Dominik Szczepańczyk | [szczepanczykd](https://github.com/szczepanczykd)       | Exadel         |
 | Madhusudhan Konda    | [madhusudhankonda](https://github.com/madhusudhankonda) | Chocolateminds |
 | Sarat Vemulapalli    | [saratvemulapalli](https://github.com/saratvemulapalli) | Amazon         |
-| Thomas Farr          | [Xtansia](https://github.com/Xtansia)                   | Amazon         |
+| Thomas Farr          | [Xtansia](https://github.com/Xtansia)                   | Independent    |
 | Vacha Shah           | [VachaShah](https://github.com/VachaShah)               | Amazon         |
 
 ## Emeritus