[ci] Update macos for cpp tests. (#11063)

Author: trivialfis

.github/workflows/main.yml

@@ -21,7 +21,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [macos-12]
+        os: [macos-13]
     steps:
     - uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
       with: