Merge pull request #6207 from martin-frbg/fix_applem_ci

CI: Move Apple-Windows jobs to the macos-15 image

Author: martin-frbg

.github/workflows/apple_m.yml

@@ -20,7 +20,7 @@ permissions:
 jobs:
   build-windows:
     if: "github.repository == 'OpenMathLib/OpenBLAS'"
-    runs-on: macos-14
+    runs-on: macos-15
 
     strategy:
       fail-fast: false