Upgrade Macos runner to use the latest

Author: lazarust

.github/workflows/build-test.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false # need to see which ones fail
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-12]
+        os: [ubuntu-latest, windows-latest, macos-latest]
         python: ["3.9", "3.10", "3.11", "3.12"]
         # this is to make the CI run on different sklearn versions
         include: