nix: fix statix hints

nix/overlays/haskell-packages.nix

@@ -2,8 +2,7 @@
 
 self: super:
 let
-  lib =
-    self.haskell.lib;
+  inherit (self.haskell) lib;
 
   overrides =
     final: prev:

nix/tools/nixpkgsTools.nix

@@ -14,13 +14,13 @@ let
     "postgrest-nixpkgs-upgrade";
 
   refUrl =
-    https://api.github.com/repos/nixos/nixpkgs/git/ref/heads/nixpkgs-unstable;
+    "https://api.github.com/repos/nixos/nixpkgs/git/ref/heads/nixpkgs-unstable";
 
   githubV3Header =
     "Accept: application/vnd.github.v3+json";
 
   tarballUrlBase =
-    https://github.com/nixos/nixpkgs/archive/;
+    "https://github.com/nixos/nixpkgs/archive/";
 
   upgrade =
     checkedShellScript