delete ios16

Author: YoungHypo

.github/workflows/firebaseai.yml

@@ -26,10 +26,6 @@ jobs:
     strategy:
       matrix:
         include:
-          - os: macos-15
-            xcode: "16.4"
-            platform: iOS
-            device: iPhone 16
           - os: macos-26
             xcode: "26.0"
             platform: iOS