MAINTAINERS: remove brgl

brgl hasn't reviewed any PRs or engaged in any Zephyr
activity since Jan 2023.

Recent activities:
  - commit: 2d59430
  - pr: maintainers: change lvgl status to "odd fixes"
    zephyrproject-rtos#53413
    (2023-01-02T07:58:09Z)

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

Author: kartben

MAINTAINERS.yml

@@ -5697,7 +5697,6 @@ West:
   maintainers:
     - faxe1008
   collaborators:
-    - brgl
     - pdgendt
     - uLipe
   files: