heptagon: unpin ocaml 4.14

pkgs/development/compilers/heptagon/default.nix pkgs/by-name/he/heptagon/package.nix

···
   fetchFromGitLab,
   makeWrapper,
   ocamlPackages,
+  fetchpatch,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
···
     rev = "v${finalAttrs.version}";
     hash = "sha256-b4O48MQT3Neh8a1Z5wRgS701w6XrwpsbSMprlqTT+CE=";
   };
+
+  patches = [
+    (fetchpatch {
+      url = "https://gitlab.inria.fr/synchrone/heptagon/-/commit/f10405e385ca25dc737727e0c210a44986929bf0.patch";
+      hash = "sha256-Sn55jEoRDYnEUg4SjuBDCNN4TNl2Dwn1fTjb9O8O1bo=";
+    })
+  ];
 
   strictDeps = true;
 

pkgs/top-level/all-packages.nix

···
     inherit (emacs.pkgs.melpaStablePackages) irony;
   };
 
-  heptagon = callPackage ../development/compilers/heptagon {
-    ocamlPackages = ocaml-ng.ocamlPackages_4_14;
-  };
-
   openjfx17 = openjfx;
   openjfx21 = callPackage ../by-name/op/openjfx/package.nix { featureVersion = "21"; };
   openjfx23 = callPackage ../by-name/op/openjfx/package.nix { featureVersion = "23"; };