.github/workflows/moocore.yml: Replace macos-13 with macos-15-intel.

Author: MLopez-Ibanez

.github/workflows/moocore.yml

@@ -37,7 +37,7 @@ jobs:
           # FIXME: needs
           # * brew install xz
           # * fix options only available in GNU diff
-          #- { os: macos-13, cc: clang, python-version: '3.10' }
+          #- { os: macos-15-intel, cc: clang, python-version: '3.10' }
           #- { os: macos-14, cc: clang, python-version: '3.10' }
     env:
       CC: ${{ matrix.cc }}