ci: use macos-15 runner

Author: ThomasK33

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-22.04, macos-13]
+        os: [ubuntu-22.04, macos-15-intel]
 
     runs-on: ${{ matrix.os }}