Updated macos runner to macos-15

Author: cliffg-softwarelibre

.github/workflows/build_run_unit_test_cmake.yml

@@ -12,7 +12,7 @@ jobs:
   build_matrix:
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest, macos-14]
+        os: [ubuntu-latest, windows-latest, macos-15]
         # os: [ubuntu-latest]
     runs-on: ${{ matrix.os }}
     defaults: