MAINTAINERS: remove warp5tw

warp5tw has never participated in any Github activity in the
zephyrproject-rtos organization

Signed-off-by: Benjamin Cabé <[email protected]>

Author: kartben

MAINTAINERS.yml

@@ -3857,7 +3857,6 @@ Nuvoton NPCM Platforms:
   status: maintained
   maintainers:
     - maxdog988
-    - warp5tw
   files:
     - soc/nuvoton/npcm/
     - boards/nuvoton/npcm*/