This is not a mistake, because Ion always ships with Icenium's latest supported Cordova version. The new Cordova version should be backwards compatible with the old version you are using. Are you using some deprecated API? We understand that it is not an ideal time for your to upgrade the Cordova version but you will have to try to do so if you want the warning to be hidden.
UPDATE: The new version of Ion is not compatible with old projects, because Cordova has changed their internal native-to-web bridge, so you will need to upgrade your projects if you want to use Ion.
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