revert GH mac runners to macos-latest now that flowutils wheels are fixed

Author: whitews

.github/workflows/test-base.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       matrix:
         python-version: ["3.9", "3.10", "3.11", "3.12"]
-        platform: [ubuntu-latest, macos-13, windows-latest]
+        platform: [ubuntu-latest, macos-latest, windows-latest]
 
     runs-on: ${{matrix.platform}}