Projucer iOS exporter: Set the default iOS deployment target to 12

extras/Projucer/Source/ProjectSaving/jucer_ProjectExport_Xcode.h

@@ -835,7 +835,7 @@ protected:
               macOSDeploymentTarget        (config, Ids::macOSDeploymentTarget,        getUndoManager(), "10.13"),
               macOSArchitecture            (config, Ids::osxArchitecture,              getUndoManager(), macOSArch_Default),
               iosBaseSDK                   (config, Ids::iosBaseSDK,                   getUndoManager()),
-              iosDeploymentTarget          (config, Ids::iosDeploymentTarget,          getUndoManager(), "11.0"),
+              iosDeploymentTarget          (config, Ids::iosDeploymentTarget,          getUndoManager(), "12.0"),
               customXcodeFlags             (config, Ids::customXcodeFlags,             getUndoManager()),
               plistPreprocessorDefinitions (config, Ids::plistPreprocessorDefinitions, getUndoManager()),
               codeSignIdentity             (config, Ids::codeSigningIdentity,          getUndoManager()),