chore: use newer macos runner (#971)

Author: rtpascual

.github/workflows/build-swift-modelgen.yml

@@ -13,7 +13,7 @@ env:
 jobs:
   Build-Swift-Modelgen:
     name: Build
-    runs-on: macos-13-xlarge
+    runs-on: macos-14-xlarge
     permissions:
       actions: read
       contents: read
@@ -22,6 +22,9 @@ jobs:
       fail-fast: true
 
     steps:
+      - name: Set Xcode version
+        run: sudo xcode-select --switch "/Applications/Xcode_16.1.0.app"
+        
       - name: Mask S3 URL
         run: echo "::add-mask::$MODELS_S3_URL"