pytest-httpbin: drop assertion that doesn't hold anymore

In Flask 2.1.0 Location headers were made relative and alot of packages
still assume absolute values. That breaks the assertion, so we drop it.

pkgs/development/python-modules/pytest-httpbin/default.nix

@@ -28,6 +28,12 @@ buildPythonPackage rec {
     six
   ];
 
+  preCheck = ''
+    # Remove assertion that doesn't hold for Flask 2.1.0
+    substituteInPlace tests/test_server.py \
+      --replace "assert response.headers['Location'].startswith('https://')" ""
+  '';
+
   checkInputs = [
     pytestCheckHook
     requests