Remove version specification from CI

.github/workflows/tests.yml

@@ -15,14 +15,12 @@ jobs:
     with:
       scheme: Flow
       platforms: iOS macOS
-      swift-versions: 5.5 5.6
 
   # Build the demo projects.
   build_demo:
     name: Build ${{ matrix.scheme }} (Xcode ${{ matrix.xcode_version }})
     # NOTE: macos-latest is NOT equivalent to macos-12 as of September 2022.
     # Source: https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners#supported-runners-and-hardware-resources
-    runs-on: macos-12
     needs: [swift_test]
     strategy:
       # Setting 'fail-fast' to 'true' implies the build will fail the first time it encounters an error.
@@ -31,9 +29,6 @@ jobs:
         scheme:
           - FlowDemo (iOS)
           - FlowDemo (macOS)
-        xcode_version:
-          - '13.2' # swift 5.5
-          - '13.4' # swift 5.6
     steps:
       - name: Build Demo
         uses: AudioKit/ci/.github/actions/build-demo@main