[CODEOWNERS] Update Cosmos Service Owners
Updating the contacts for Cosmos, by request.
/sdk/cosmos/ @kushagraThapar @simorenoh @simplynaveen20 @xinlian12 @annatisch @tjprescott @JericHunter
# ServiceLabel: %Cosmos %Service Attention
-#/<NotInRepo>/ @simorenoh @gahl-levy
+#/<NotInRepo>/ @pjohari-ms @simorenoh @gahl-levy
# PRLabel: %Data Factory
/sdk/datafactory/ @hvermis
