tests: test on macOS 13

Author: firstred

.github/workflows/test.yaml

@@ -5,7 +5,7 @@ jobs:
         runs-on: ${{ matrix.operating-system }}
         strategy:
             matrix:
-                operating-system: [ 'macos-14' ]
+                operating-system: [ 'macos-13' ]
                 php-versions: [ '7.4' ]
         steps:
             -   name: Checkout repo