Use older macos runner for Qt 5.x

- current macos does no longer support these

Author: mrbean-bremen

.github/workflows/build.yml

@@ -205,12 +205,12 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-       macos-version:  ['latest']
+       macos-version:  ['macos-14']
        python-version: ['3.9']
        qt-version: ['5.9.*']
        configuration: ['release','debug']
        include:
-         - macos-version: 'latest'
+         - macos-version: 'macos-14'
            python-version: '3.11'
            qt-version: '5.12.*'
            configuration: 'debug'