Remove redundant OCaml 5.0.0 case from unlocked CI

Author: sim642

.github/workflows/unlocked.yml

@@ -34,9 +34,6 @@ jobs:
           - os: ubuntu-latest
             ocaml-compiler: 4.14.x
             z3: true
-          - os: ubuntu-latest
-            ocaml-compiler: 5.0.0
-            apron: false
 
     # customize name to use readable string for apron instead of just a boolean
     # workaround for missing ternary operator: https://github.com/actions/runner/issues/409