Changed Xcode version to 15.2 in GitHub Actions

This changes the `xcode-version` parameter of the workflow to use Xcode 15.2 in order to check for proper compilation on the latest release

Author: admkopec

.github/workflows/swift.yml

@@ -11,7 +11,7 @@ jobs:
       - name: Select latest available Xcode
         uses: maxim-lobanov/setup-xcode@v1
         with:
-          xcode-version: '15.0.0'
+          xcode-version: '15.2.0'
       - name: Checkout Repository
         uses: actions/checkout@v2
       - name: Build Swift Debug Package