ci: try macos-14 + Xcode 15.4 for Capacitor iOS build

macos-15 runner has simulator runtime mismatch with the iphoneos SDK.

Author: j3k0

.github/workflows/build-capacitor-ios.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   build:
-    runs-on: macos-15
+    runs-on: macos-14
     steps:
       - uses: actions/checkout@v4
 
@@ -20,7 +20,7 @@ jobs:
       - name: Select Xcode
         uses: maxim-lobanov/setup-xcode@v1
         with:
-          xcode-version: '16.2'
+          xcode-version: '15.4'
 
       - name: Install dependencies and build TypeScript
         run: |