ci: Update MacOS to latest OS (KhronosGroup#5855)

Author: spencer-lunarg

.github/workflows/ios.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
         matrix:
-          os: [ macos-12, macos-13 ]
+          os: [ macos-latest ]
     steps:
         - uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
         - uses: lukka/get-cmake@b516803a3c5fac40e2e922349d15cdebdba01e60 # v3.30.5