ci: use new macos runners for Python (#412)

Author: sd2k

.github/workflows/python.yml

@@ -120,10 +120,10 @@ jobs:
     strategy:
       matrix:
         platform:
-          - runner: macos-13
-            target: x86_64
-          - runner: macos-14
+          - runner: macos-15
             target: aarch64
+          - runner: macos-15-intel
+            target: x86_64
     steps:
       - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
         with: