Should anyone run into this - the issue was related to a market place module which contained a widget which referenced the react-native-webview with a version below 11.26.1 and hence Mendix added it as a dependency in the build. This is not compatible with Android SDK target of 33.
To fix I modified the widgets <widget>.json (inside the MPK file - in this case com.itvisors.widget.native.NativeSignature.mpk) to reference the correct version of the webview. dependency.
To find it, I had to search for .json files in the project folder which contained a reference to react-native-webview - this led me to the deployed widget files, and from there I inferred the most likely marketplace module.