Only run macos-latest build with ldc

Author: schveiguy

.github/workflows/dub.yml

@@ -22,14 +22,17 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-latest, windows-latest, macos-latest ]
+        os: [ ubuntu-latest, windows-latest, macos-14 ]
         compiler:
           - dmd-latest
           - ldc-latest
           - dmd-2.101.2
           - dmd-2.098.1
           - ldc-1.31.0 # eq to dmd v2.101.2
           - ldc-1.28.1 # eq to dmd v2.098.1
+        include:
+          - compiler: ldc-latest
+            os: macos-latest
     steps:
       - uses: actions/checkout@v3