[INFRA] Use macos-14

Author: eseiler

.github/workflows/ci_macos.yml

@@ -33,7 +33,7 @@ defaults:
 jobs:
   build:
     name: ${{ matrix.name }}
-    runs-on: macos-12
+    runs-on: macos-14
     timeout-minutes: 120
     if: github.repository_owner == 'seqan' || github.event_name == 'workflow_dispatch' || github.event.label.name == 'lint'
     strategy: