Update and fix nix flake (#341)

Since nix tries to update inputs on newer versions out of, I suppose,
some introduced incompatibility, `nix build` fails. And nixpkgs from
2023 sounds rather obsolete at this point, so update was kinda due I
think.
On newer versions of nixpkgs however buildGoModule has changed and
requires one of its arguments to be called vendorHash and not
vendorSha256, this patch changes that as well.

Fixes #297, closes #314, closes #307

nix/default.nix

@@ -7,13 +7,13 @@ in
     buildGoModule ? pkgs.buildGoModule,
     fetchFromGitHub ? pkgs.fetchFromGitHub,
     installShellFiles ? pkgs.installShellFiles,
-    # version and vendorSha256 should be specified by the caller
+    # version and vendorHash should be specified by the caller
     version ? "latest",
-    vendorSha256,
+    vendorHash,
   }:
     buildGoModule rec {
       pname = "packwiz";
-      inherit version vendorSha256;
+      inherit version vendorHash;
 
       src = ./..;
 

nix/prefetcher.nix

@@ -9,7 +9,7 @@ pkgs.callPackage (import ./.) {
     ## `pkgs.buildGo121Module` in Nixpkgs.
     ## `buildGoModule` is set as `pkgs.buildGoModule` to try and work around
     ## `vendorHash` issues in the future.
-  vendorSha256 = sha256;
+  vendorHash = sha256;
 }
 // {
   outputHash = sha256;