Remove xcode version specification entirely

Author: aure

.github/workflows/tests.yml

@@ -30,15 +30,12 @@ jobs:
         scheme:
           - TonicDemo (iOS)
           - TonicDemo (macOS)
-        xcode_version:
-          - '14.0' # swift 5.6
     steps:
       - name: Build Demo
         uses: AudioKit/ci/.github/actions/build-demo@main
         with:
           project: Demo/TonicDemo.xcodeproj
           scheme: ${{ matrix.scheme }}
-          xcode_version: ${{ matrix.xcode_version }}
 
   # Send notification to Discord on failure.
   send_notification: