fix 2: Update Xcode version to 15.4 in CI configuration

Author: reeshika-h

.github/workflows/ci.yml

@@ -77,7 +77,7 @@ jobs:
     - name: Set up Xcode
       uses: maxim-lobanov/setup-xcode@v1
       with:
-        xcode-version: latest
+        xcode-version: '15.4'
     - name: Create config file
       run: |
         echo '{