chore: update (and refactor) flake inputs

Author: jfroche

flake.lock

@@ -2,17 +2,35 @@
   description = "Prototype tooling for deploying PostgreSQL";
 
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
-    flake-utils.url = "github:numtide/flake-utils";
-    nix2container.url = "github:nlewo/nix2container";
-    nix-editor.url = "github:snowfallorg/nix-editor";
-    rust-overlay.url = "github:oxalica/rust-overlay";
-    nix-fast-build.url = "github:Mic92/nix-fast-build";
+    nixpkgs.url = "https://channels.nixos.org/nixos-unstable/nixexprs.tar.xz";
     flake-parts.url = "github:hercules-ci/flake-parts";
-    treefmt-nix.url = "github:numtide/treefmt-nix";
-    treefmt-nix.inputs.nixpkgs.follows = "nixpkgs";
-    git-hooks.url = "github:cachix/git-hooks.nix";
-    git-hooks.inputs.nixpkgs.follows = "nixpkgs";
+    flake-utils.url = "github:numtide/flake-utils";
+    treefmt-nix = {
+      url = "github:numtide/treefmt-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    nix-editor = {
+      url = "github:snowfallorg/nix-editor";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    nix-fast-build = {
+      url = "github:Mic92/nix-fast-build";
+      inputs.nixpkgs.follows = "nixpkgs";
+      inputs.flake-parts.follows = "flake-parts";
+      inputs.treefmt-nix.follows = "treefmt-nix";
+    };
+    nix2container = {
+      url = "github:nlewo/nix2container";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    git-hooks = {
+      url = "github:cachix/git-hooks.nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
   outputs =