Update macos-11 for CI run

From GitHub: The macos-11 label has been deprecated and will no longer
be available after 28 June 2024.

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

@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [windows-2019, ubuntu-latest, macos-11]
+        os: [windows-2019, ubuntu-latest, macos-12]
 
     runs-on: ${{ matrix.os }}
     timeout-minutes: 60