[Github Actions] Switch to macos-14 image

Author: buffer

.github/workflows/osx.yml

@@ -10,7 +10,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ['3.9', '3.10', '3.11', '3.12', '3.13', '3.14']
-        os: [macos-13]
+        os: [macos-14]
 
     steps:
       - name: Checkout repository