This version of Unity is unsupported.
Removed

EditorUserBuildSettings.iOSBuildConfigType

Obsolete iOSBuildConfigType is obsolete. Use iOSXcodeBuildConfig instead.
Upgrade to iOSXcodeBuildConfig
public static iOSBuildType iOSBuildConfigType;

Description

Scheme with which the project will be run in Xcode.