Set dmd 2.108.1 to min on Mac builds

Author: SingingBush

.github/workflows/dub.yml

@@ -46,7 +46,7 @@ jobs:
           ## macos-13 is the latest Mac runner with Intel cpu
           - { os: macos-13, compiler: dmd-latest }
           - { os: macos-13, compiler: ldc-latest }
-          - { os: macos-13, compiler: dmd-2.106.1 }
+          - { os: macos-13, compiler: dmd-2.108.1 }
           - { os: macos-13, compiler: ldc-1.32.2 }
         exclude:
           - { os: windows-latest, compiler: dmd-2.098.1 }