Update CODEOWNERS (#5415)

* Update CODEOWNERS

@qgp it looks like you and @marcovanleeuwen were listed already.
Added myself.

* Add ownership for DataFormats/Detectors/Upgrades

Author: mconcas

CODEOWNERS

@@ -42,7 +42,7 @@
 /DataFormats/Detectors/TOF                     @noferini 
 /DataFormats/Detectors/TPC                     @davidrohr @wiechula @shahor02
 /DataFormats/Detectors/TRD                     @jolopezl @bazinski @tdietel @martenole
-/DataFormats/Detectors/Upgrades                @qgp @marcovanleeuwen
+/DataFormats/Detectors/Upgrades                @qgp @marcovanleeuwen @mconcas
 /DataFormats/Detectors/ZDC                     @coppedis
 
 #/DataFormats/Headers
@@ -69,7 +69,7 @@
 /Detectors/TOF                     @noferini 
 /Detectors/TPC                     @davidrohr @wiechula @shahor02
 /Detectors/TRD                     @jolopezl @bazinski @tdietel @martenole
-/Detectors/Upgrades                @qgp @marcovanleeuwen
+/Detectors/Upgrades                @qgp @marcovanleeuwen @mconcas
 /Detectors/ZDC                     @coppedis
 
 /EventVisualisation  @jmyrcha @AliceO2Group/framework-admins