Prospective fix for iOS iPad builds

As the GH images are updated with new iOS SDKs, not all combinations of device and iOS versions are always available due to limited disk space. The latest iOS sdks seem now only installed for the latest 13-inch iPad.

Author: tronical

.github/workflows/nightly_tests.yaml

@@ -149,7 +149,7 @@ jobs:
                 - demo: demos/home-automation/rust
                   scheme: "Home Automation"
                   bundle_id: dev.slint.demos.HomeAutomation
-                  device: iPad Pro 13-inch (M4)
+                  device: iPad Pro 13-inch (M5)
                 - demo: demos/energy-monitor
                   scheme: "Energy Monitor"
                   bundle_id: dev.slint.demos.EnergyMonitor