Tweak specific Xcode and iOS versions used by CI

Author: freakboy3742

.github/workflows/build.yml

@@ -417,10 +417,10 @@ jobs:
       # https://github.com/actions/runner-images/issues/12751.
       - name: Select Xcode version
         run: |
-          sudo xcode-select --switch /Applications/Xcode.app
+          sudo xcode-select --switch /Applications/Xcode_26.2.app
 
       - name: Build and test
-        run: python3 Apple ci iOS --fast-ci --simulator 'iPhone 17,OS=latest'
+        run: python3 Apple ci iOS --fast-ci --simulator 'iPhone 16e,OS=26.2'
 
   build-wasi:
     name: 'WASI'