MAINTAINERS: add marc-hb as West collaborator

Some evidence if needed:
- #92181
- https://github.com/zephyrproject-rtos/west/graphs/contributors

Signed-off-by: Marc Herbert <[email protected]>

Author: marc-hb

MAINTAINERS.yml

@@ -4902,6 +4902,7 @@ West:
     - mbolivar
     - carlescufi
     - swinslow
+    - marc-hb
   files:
     - scripts/west-commands.yml
     - scripts/west_commands/