ci: run the ios leg on macos-26, pinned to a device and a runtime

macos-26 carries no iPhone 16 Pro at all, and on macos-15 that name spanned
iOS 18.5 through 26.2, so the leg could boot a two-major-old runtime. the
pair is now iPhone 17 Pro on iOS 26.2, resolved to a udid before boot, and
an image that drops it fails naming what it does carry.

iPhone 17 Pro is what examples/folio/justfile already defaulted to.

.github/scripts/folio-run-test.sh

@@ -110,7 +110,7 @@ expect_argv "--seed" argv-ios
 expect_argv "7" argv-ios
 expect_argv "240" argv-ios
 expect_argv "20m" argv-ios
-expect_argv "iPhone 16 Pro" argv-ios
+expect_argv "iPhone 17 Pro" argv-ios
 
 run argv-android android 2 <<TRACE
 $on_txn

.github/scripts/folio-run.sh

@@ -102,7 +102,7 @@ case "$platform" in
     # away from the `simctl uninstall` + `install` path that races FrontBoard
     # ("app.folio is unknown to FrontBoard"), which needs an app path to reach.
     folio_args+=(--platform ios
-      --ios-device "${IOS_DEVICE:-iPhone 16 Pro}")
+      --ios-device "${IOS_DEVICE:-iPhone 17 Pro}")
     ;;
   web)
     dist="examples/folio/app/webApp/build/dist/wasmJs/developmentExecutable"