Bring back runs-on

.github/workflows/tests.yml

@@ -19,7 +19,7 @@ jobs:
     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
+    runs-on: macos-13
     needs: [swift_test]
     strategy:
       # Disabling fail-fast ensures that the job will run all configurations of the matrix, even if one fails.
@@ -28,7 +28,7 @@ jobs:
         scheme:
           - KeyboardDemo (iOS)
           - KeyboardDemo (macOS)
-\    steps:
+    steps:
       - name: Build Demo
         uses: AudioKit/ci/.github/actions/build-demo@main
         with: