[CI] Explicitly use macos-14.

Author: vyazelenko

.github/workflows/ci.yml

@@ -296,7 +296,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ 'macos-latest' ]
+        os: [ 'macos-14' ]
     env:
       CC: clang
       CXX: clang++