update CODEOWNERS for Common directory

Author: dsekihat

CODEOWNERS

@@ -12,8 +12,8 @@
 # @alibuild has to be in each line to allow self approval of PRs
 
 * @AliceO2Group/core @alibuild @jgrosseo @iarsene @ktf @ddobrigk @dsekihat
-/Common/CCDB @alibuild @jgrosseo @iarsene @ekryshen @ddobrigk
-/Common/Tools/Multiplicity @alibuild @ddobrigk @victor-gonzalez
+/Common/CCDB @alibuild @jgrosseo @iarsene @ekryshen @ddobrigk @dsekihat
+/Common/Tools/Multiplicity @alibuild @ddobrigk @victor-gonzalez @dsekihat
 /ALICE3 @alibuild @njacazio @hscheid @jesgum
 /DPG @alibuild @chiarazampolli @alcaliva @catalinristea
 /DPG/Tasks/AOTEvent @alibuild @ekryshen @strogolo @altsybee