Fix git action to use Xcode 16.2

Author: aashishpatil-g

.github/workflows/spm.yml

@@ -32,6 +32,8 @@ jobs:
       FIREBASE_MAIN: 1
     steps:
       - uses: actions/checkout@v4
+      - name: Xcode
+        run: sudo xcode-select -s /Applications/Xcode_16.2.app/Contents/Developer
       - name: Generate Swift Package.resolved
         id: swift_package_resolve
         run: |