Update CODEOWNERS for upgrades (#12125)

Author: mconcas

CODEOWNERS

@@ -41,7 +41,7 @@
 /DataFormats/Detectors/TOF                     @noferini
 /DataFormats/Detectors/TPC                     @davidrohr @wiechula @shahor02
 /DataFormats/Detectors/TRD                     @f3sch @bazinski @martenole
-/DataFormats/Detectors/Upgrades                @qgp @marcovanleeuwen @mconcas
+/DataFormats/Detectors/Upgrades                @mconcas
 /DataFormats/Detectors/Upgrades/ITS3           @fgrosa @arossi81
 /DataFormats/Detectors/ZDC                     @coppedis
 
@@ -72,7 +72,7 @@
 /Detectors/TOF                     @noferini
 /Detectors/TPC                     @davidrohr @wiechula @shahor02
 /Detectors/TRD                     @f3sch @bazinski @martenole
-/Detectors/Upgrades                @qgp @mconcas
+/Detectors/Upgrades                @mconcas
 /Detectors/Upgrades/ITS3           @fgrosa @arossi81 @mconcas
 /Detectors/ZDC                     @coppedis
 /Detectors/CTF                     @shahor02