chore: update nix flake (#2692)

* chore: update nix flake

* try debian-10

* update

* try apt instead of apt-get

* apt update

Author: anmonteiro

.circleci/config.yml

@@ -12,7 +12,8 @@ common_steps: &common_steps
     - run:
         name: "Install npm"
         command: |
-          sudo apt-get install -y nodejs npm
+          sudo apt update
+          sudo apt install -y nodejs npm
           mkdir -p ~/.npm-global
           npm config set prefix $NPM_CONFIG_PREFIX
     - checkout
@@ -24,12 +25,12 @@ common_steps: &common_steps
     - run:
         name: "Initialize opam"
         command: |
-          sudo apt-get install -y m4
+          sudo apt install -y m4
           opam remote set-url default https://opam.ocaml.org
     - run:
         name: "Install deps"
         command: |
-          sudo apt-get install -y pkg-config libncurses5-dev
+          sudo apt install -y pkg-config libncurses5-dev
           opam update
           opam install -y dune menhir utop
     - run:
@@ -148,13 +149,14 @@ jobs:
           name: "Install npm"
           command: |
             curl -sL https://deb.nodesource.com/setup_12.x | sudo -E bash -
-            sudo apt-get install -y nodejs
+            sudo apt update
+            sudo apt install -y nodejs
             mkdir -p ~/.npm-global
             npm config set prefix $NPM_CONFIG_PREFIX
       - run:
           name: "Install m4"
           command: |
-            sudo apt-get install -y m4
+            sudo apt install -y m4
       - restore_cache:
           <<: *esy_cache_key
       - restore_cache:

flake.lock

@@ -3,13 +3,14 @@
 
   inputs.nix-filter.url = "github:numtide/nix-filter";
   inputs.flake-utils.url = "github:numtide/flake-utils";
-  inputs.nixpkgs.url = "github:anmonteiro/nix-overlays";
+  inputs.nixpkgs.url = "github:nix-ocaml/nix-overlays";
+  inputs.nixpkgs.inputs.flake-utils.follows = "flake-utils";
 
   outputs = { self, nixpkgs, flake-utils, nix-filter }:
     flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs = nixpkgs.legacyPackages."${system}".extend (self: super: {
-          ocamlPackages = super.ocaml-ng.ocamlPackages_5_00;
+          ocamlPackages = super.ocaml-ng.ocamlPackages_5_0;
         });
       in
       rec {