chore(sourcehut): remove all traces of custom cacert package fuckery

I found out that you can set an env variable to make python's request
use the global cert store, this sidesteps the issue I have been having
with sourcehut.

nixos/configuration.nix

@@ -2,12 +2,12 @@
 # your system.  Help is available in the configuration.nix(5) man page
 # and in the NixOS manual (accessible by running ‘nixos-help’).
 
-{ pkgs, nixpkgsWithPatchedCACert, ... }:
+{ pkgs, ... }:
 {
   imports =
     [ # Include the results of the hardware scan.
       ./hardware-configuration.nix
-      (import ./sourcehut.nix { pkgs = nixpkgsWithPatchedCACert; })
+      ./sourcehut.nix
     ];
 
   # Bootloader.