Build with OCaml 5.1.1

Author: cknitt

.github/workflows/ci.yml

@@ -56,7 +56,7 @@ jobs:
     - name: Use OCaml
       uses: ocaml/setup-ocaml@v2
       with:
-        ocaml-compiler: 4.14.x
+        ocaml-compiler: 5.1.1
 
     - name: Use Node.js
       uses: actions/setup-node@v4