ci: Update to macOS 14

macOS 12 is no longer available in GitHub Actions.

Author: auscompgeek

.github/workflows/test.yml

@@ -31,7 +31,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: ["ubuntu-22.04", "macos-12", "windows-2022"]
+        os: ["ubuntu-22.04", "macos-14", "windows-2022"]
         python_version:
         - '3.8'
         - '3.9'