[ci] [ocaml] Track OCaml 4.12
[ci] [ocaml] Track OCaml 4.12

coq/coq,gares/coq,Zimmi48/coq,JasonGross/coq,ejgallego/coq,gares/coq,coq/coq,Zimmi48/coq,ejgallego/coq,JasonGross/coq,gares/coq,ejgallego/coq,SkySkimmer/coq,Zimmi48/coq,SkySkimmer/coq,Zimmi48/coq,gares/coq,JasonGross/coq,SkySkimmer/coq,ejgallego/coq,coq/coq,coq/coq,silene/coq,JasonGross/coq,gares/coq,silene/coq,silene/coq,SkySkimmer/coq