CI: deprecate macos-12 (#905)

Author: perazz

.github/workflows/CI.yml

@@ -19,7 +19,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-12]
+        os: [ubuntu-latest, macos-13]
         toolchain:
           - {compiler: gcc, version: 10}
           - {compiler: gcc, version: 11}
@@ -34,9 +34,11 @@ jobs:
             toolchain:
               - {compiler: gcc, version: 10}
         exclude:
-          - os: macos-12
+          - os: macos-13
+            toolchain: {compiler: intel-classic, version: '2021.9'}
+          - os: macos-13
             toolchain: {compiler: intel, version: '2024.1'}
-          - os: macos-12
+          - os: macos-13
             toolchain: {compiler: gcc, version: 13}
     env:
       BUILD_DIR: ${{ matrix.build == 'cmake' && 'build' || '.' }}