[CI] Move Mac runner to MacOS 13 (#15978)

Github Actions no longer
[supports](actions/runner-images#10721) MacOS
12 and it's causing postcommit to
[fail](https://github.com/intel/llvm/actions/runs/11669376491/job/32491193990).
This is confirmed working
[here](https://github.com/intel/llvm/actions/runs/11669692319/job/32492218310?pr=15978),
build in progress but the runner starts now. Will confirm build passes
before merging.

Signed-off-by: Sarnie, Nick <[email protected]>

Author: sarnex

.github/workflows/sycl-macos-build-and-test.yml

@@ -24,7 +24,7 @@ permissions: read-all
 jobs:
   build:
     name: Build
-    runs-on: macos-12
+    runs-on: macos-13
     env:
       CCACHE_DIR: $GITHUB_WORKSPACE/build_cache_${{ inputs.build_cache_suffix }}
       CCACHE_MAXSIZE: ${{ inputs.build_cache_size }}