chore: test Mooncake on Julia 1.12 (#913)

Author: gdalle

.github/workflows/Test.yml

@@ -66,8 +66,6 @@ jobs:
             group: Back/ChainRules
           - version: '1.12'
             group: Back/Enzyme
-          - version: '1.12'
-            group: Back/Mooncake
           - version: '1.12'
             group: Back/DifferentiateWith
     env: