flake.nix: switch to nix-community/flake-compat

edolstra/flake-compat is unmaintained.

cargo2nix also still pulls in edolstra/flake-compat, make it follow the
nix-community one.

flake.lock

@@ -2,7 +2,9 @@
   "nodes": {
     "cargo2nix": {
       "inputs": {
-        "flake-compat": "flake-compat",
+        "flake-compat": [
+          "flake-compat"
+        ],
         "flake-utils": "flake-utils",
         "nixpkgs": [
           "nixpkgs"
@@ -25,17 +27,16 @@
       }
     },
     "flake-compat": {
-      "flake": false,
       "locked": {
-        "lastModified": 1650374568,
-        "narHash": "sha256-Z+s0J8/r907g149rllvwhb4pKi8Wam5ij0st8PwAh+E=",
-        "owner": "edolstra",
+        "lastModified": 1688025799,
+        "narHash": "sha256-ktpB4dRtnksm9F5WawoIkEneh1nrEvuxb5lJFt1iOyw=",
+        "owner": "nix-community",
         "repo": "flake-compat",
-        "rev": "b4a34015c698c7793d592d66adbab377907a2be8",
+        "rev": "8bf105319d44f6b9f0d764efa4fdef9f1cc9ba1c",
         "type": "github"
       },
       "original": {
-        "owner": "edolstra",
+        "owner": "nix-community",
         "repo": "flake-compat",
         "type": "github"
       }
@@ -111,10 +112,7 @@
     "root": {
       "inputs": {
         "cargo2nix": "cargo2nix",
-        "flake-compat": [
-          "cargo2nix",
-          "flake-compat"
-        ],
+        "flake-compat": "flake-compat",
         "flake-utils": [
           "cargo2nix",
           "flake-utils"

flake.nix

@@ -6,6 +6,8 @@
   inputs.nixpkgs.url =
     "github:NixOS/nixpkgs/94517a501434a627c5d9e72ac6e7f26174b978d3";
 
+  inputs.flake-compat.url = "github:nix-community/flake-compat";
+
   inputs.cargo2nix = {
     # As of 2022-10-18: two small patches over unstable branch, one for clippy and one to fix feature detection
     url = "github:Alexis211/cargo2nix/a7a61179b66054904ef6a195d8da736eaaa06c36";
@@ -20,16 +22,17 @@
       "github:oxalica/rust-overlay/74f1a64dd28faeeb85ef081f32cad2989850322c";
 
     inputs.nixpkgs.follows = "nixpkgs";
+    inputs.flake-compat.follows = "flake-compat";
   };
 
   inputs.flake-utils.follows = "cargo2nix/flake-utils";
-  inputs.flake-compat.follows = "cargo2nix/flake-compat";
 
   outputs = { self, nixpkgs, cargo2nix, flake-utils, ... }:
     let
       git_version = self.lastModifiedDate;
       compile = import ./nix/compile.nix;
-    in flake-utils.lib.eachDefaultSystem (system:
+    in
+    flake-utils.lib.eachDefaultSystem (system:
       let pkgs = nixpkgs.legacyPackages.${system};
       in {
         packages = {