ci: run with xcode 26 and ios 26 (#1062)

* ci: run with xcode 26 and ios 26

* run with macos 15

Author: KazuCocoa

.github/workflows/functional-test.yml

@@ -12,6 +12,10 @@ jobs:
       fail-fast: false
       matrix:
         test_targets:
+          - HOST_OS: 'macos-15'
+            XCODE_VERSION: '26.0'
+            IOS_VERSION: '26.0'
+            IOS_MODEL: iPhone 17
           - HOST_OS: 'macos-15'
             XCODE_VERSION: '16.4'
             IOS_VERSION: '18.4'