Projucer: Bumped Xcode LastUpgradeCheck for Xcode 13

extras/Projucer/Source/ProjectSaving/jucer_ProjectExport_Xcode.h

@@ -3329,7 +3329,7 @@ private:
     {
         std::map<String, String> attributes;
 
-        attributes["LastUpgradeCheck"] = "1250";
+        attributes["LastUpgradeCheck"] = "1300";
         attributes["ORGANIZATIONNAME"] = getProject().getCompanyNameString().quoted();
 
         if (projectType.isGUIApplication() || projectType.isAudioPlugin())