Troubleshoot CI

Author: standage

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        os: [ubuntu-latest, macos-13]
     steps:
     - name: Code checkout
       uses: actions/checkout@v4