pythonPackages.warrant: Fix compat with pip 10

Fixes #41866

pkgs/development/python-modules/warrant/default.nix

···
-{ lib, buildPythonPackage, fetchFromGitHub, fetchPypi
+{ lib, buildPythonPackage, fetchFromGitHub, fetchPypi, fetchpatch
 , mock
 , boto3, envs, python-jose, requests }:
 
···
     rev    = "ff2e4793d8479e770f2461ef7cbc0c15ee784395";
     sha256 = "0gw3crg64p1zx3k5js0wh0x5bldgs7viy4g8hld9xbka8q0374hi";
   };
+
+  patches = [
+    (fetchpatch {
+      name = "fix-pip10-compat.patch";
+      url = " https://github.com/capless/warrant/commit/ae17d17d9888b9218a8facf6f6ad0bf4adae9a12.patch";
+      sha256 = "1lvqi2qfa3kxdz05ab2lc7xnd3piyvvnz9kla2jl4pchi876z17c";
+    })
+  ];
 
   # this needs to go when 0.6.2 or later is released
   postPatch = ''