Add macos-14 runner

Author: kintel

.github/workflows/offscreen.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        os: [ubuntu-latest, macos-latest, macos-14]
 
     steps:
     - uses: actions/checkout@v3