ci: update GHA MacOS images

- remove macos-11 (dropped) and macos-12 (deprecated)
- add macos-13, macos-14, macos-15

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

@@ -19,7 +19,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-22.04, ubuntu-20.04, windows-2022, windows-2019, macos-12, macos-11]
+        os: [ubuntu-22.04, ubuntu-20.04, windows-2022, windows-2019, macos-15, macos-14, macos-13]
     steps:
     - uses: actions/checkout@v3
     - name: Show initial environment
@@ -59,7 +59,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [macos-12, macos-11]
+        os: [macos-15, macos-14, macos-13]
         cmp: [clang]
         configuration: [default, debug]
     steps: