.github/workflows/make-check.yml: drop github ci runner macos-13

The macOS 13 runner image will be retired by December 4th, 2025.

Author: g-pape

.github/workflows/make-check.yml

@@ -21,7 +21,6 @@ jobs:
           - macos-latest
           - macos-15
           - macos-14
-          - macos-13
     runs-on: ${{ matrix.runners }}
     steps:
     - uses: actions/checkout@v4