style: Switch to nixfmt from nixpkgs-fmt

Most of the ecosystem has moved to this formatter,
and many people configured their editors to autoformat it with this formatter.

Closes: https://git.snix.dev/snix/snix/issues/62
Change-Id: Icf39e7836c91fc2ae49fbe22a40a639105bfb0bd
Reviewed-on: https://cl.snix.dev/c/snix/+/30671
Reviewed-by: Florian Klink <flokli@flokli.de>
Tested-by: besadii
Autosubmit: Ilan Joselevich <personal@ilanjoselevich.com>

tools/crfo-approve.nix

@@ -22,7 +22,12 @@ pkgs.writeShellScriptBin "crfo-approve" ''
     exit 1
   fi
 
-  export PATH="${pkgs.lib.makeBinPath [ pkgs.httpie pkgs.jq ]}:''${PATH}"
+  export PATH="${
+    pkgs.lib.makeBinPath [
+      pkgs.httpie
+      pkgs.jq
+    ]
+  }:''${PATH}"
 
   readonly CL_ID="''${1}"
   readonly PATCHSET="''${2}"