No 5.1 on windows.

Author: Drup

.github/workflows/workflow.yml

@@ -29,8 +29,6 @@ jobs:
             ocaml-compiler: 4.14.x
           - os: macos-latest
             ocaml-compiler: 5.1.x
-          - os: windows-latest
-            ocaml-compiler: 5.1.x
 
     runs-on: ${{ matrix.os }}