ci: fix macos-latest only supporting newer versions of Python

Author: Ljzd-PRO

.github/workflows/codecov.yml

@@ -32,7 +32,9 @@ jobs:
     strategy:
       matrix:
         python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
-        os: [ubuntu-latest, windows-latest, macos-latest]
+        # macos-14 aka. macos-latest has switched to being an ARM runner, only supporting newer versions of Python.
+        # https://github.com/actions/setup-python/issues/855#issuecomment-2096792205
+        os: [ubuntu-latest, windows-latest, macos-13] # Use macos-13
       fail-fast: false
 
     steps: