macOs CI update. (#12998)

macOs CI update.

since sonoma (14) had been released since few months, we could afford to
upgrade to its previous release.

.github/workflows/nightly.yml

@@ -234,7 +234,7 @@ jobs:
         debug: [true, false]
         zts: [true, false]
     name: "${{ matrix.branch.name }}_MACOS_${{ matrix.debug && 'DEBUG' || 'RELEASE' }}_${{ matrix.zts && 'ZTS' || 'NTS' }}"
-    runs-on: macos-12
+    runs-on: macos-13
     steps:
       - name: git checkout
         uses: actions/checkout@v4

.github/workflows/push.yml

@@ -150,7 +150,7 @@ jobs:
         if: ${{ !matrix.asan }}
         uses: ./.github/actions/verify-generated-files
   MACOS_DEBUG_NTS:
-    runs-on: macos-12
+    runs-on: macos-13
     steps:
       - name: git checkout
         uses: actions/checkout@v4