Add newer version of OCaml

[y-yu]

• SATySFi does not support OCaml 4.09 on CI so I drop this version
  • https://github.com/gfngfn/SATySFi/blob/8a1b1fbefae9c6958d06ee64218619e00ef0afc7/.github/workflows/ci.yml#L12-L15

[na4zagin3]

Thank you!!