MAINTAINERS: remove ppryga due to inactivity

No activity from this user for over 2 years. It is likely that they're
now @ppryga-nordic but since it doesn't seem anybody noticed the
discrepancy in many years, I think it is safe to drop the entry :)

Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>

Author: kartben

MAINTAINERS.yml

@@ -506,7 +506,6 @@ Bluetooth Controller:
   collaborators:
     - carlescufi
     - thoh-ot
-    - ppryga
     - wopu-ot
     - erbr-ot
     - Tronil