github CI: macos-13 -> macos-14

Author: kp-cat

.github/workflows/python-ci.yml

@@ -41,11 +41,11 @@ jobs:
             os: macos-latest
         include: # So run those legacy versions on Intel CPUs.
           - python-version: "3.5"
-            os: macos-13
+            os: macos-14
           - python-version: "3.6"
-            os: macos-13
+            os: macos-14
           - python-version: "3.7"
-            os: macos-13
+            os: macos-14
 
 
     steps: