TST: Replace macos-13 with macos-14

Author: pllim

.github/workflows/main.yml

@@ -37,7 +37,7 @@ jobs:
 
         # Test with more compilers, for the OpenMP helpers
         - macos: py313-test-osxclang-conda
-          runs-on: macos-13
+          runs-on: macos-14
           coverage: ''
         - linux: py310-test-linuxgcc-conda
           coverage: ''