That's easy.
Those files are contained in Xcode itself.
Thus, all you have to do to use devices with a newer iOS version - create junction folder (hard link) of those support files from new Xcode (in our case - the beta 11.2) to older Xcode (11.1).
And yes, before that you have to download beta Xcode 11.2.
Otherwise, you also can download only support files from the Internet, if someone already shared them and just toss 'em to Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport
P.S. to create junction folder use this command in terminal:
ln -s /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/13.2 /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport
It allows you to not to duplicate the same files across your Mac
P.S. Be aware! You have to launch newer Xcode (Beta) you downloaded at least one time to install updated Xcode Tools before you can use symlinks (hard links, junction folder) to Device Support files in older Xcode, otherwise you'll get an error and will not be able to build your app.