MAINTAINERS: remove Mani-Sadhasivam

Mani-Sadhasivam hasn't reviewed any PRs or engaged in any Zephyr activity since September 2023. Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>

Author: kartben

MAINTAINERS.yml

@@ -1837,7 +1837,6 @@ Documentation Infrastructure:
 "Drivers: LED":
  status: maintained
  maintainers:
- - Mani-Sadhasivam
  - simonguinot
  collaborators:
  - jeppenodgaard
@@ -3104,7 +3103,6 @@ LoRa and LoRaWAN:
  maintainers:
  - JordanYates
  collaborators:
- - Mani-Sadhasivam
  - martinjaeger
  - mniestroj
  files:
@@ -5689,9 +5687,7 @@ West:
  - "area: LoRa"
 
 "West project: loramac-node":
- status: maintained
- maintainers:
- - Mani-Sadhasivam
+ status: odd fixes
  files:
  - modules/loramac-node/
  labels: