You can download the newer Xcode in parallel and add a symlink to the required device support. This should allow you to build for your device.
/Applications/Xcode_13.2.1.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/
/Applications/Xcode_13.3.1.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/15.4