Go back to macos13

[skip ci]

Author: matthew-brett

.github/workflows/wheels-macos.yml

@@ -16,7 +16,7 @@ env:
 jobs:
   build:
     name: ${{ matrix.python }} ${{ matrix.platform }}
-    runs-on: "macos-latest"
+    runs-on: "macos-13"
     strategy:
       fail-fast: false
       matrix: