python3{11,12}Packages.mhcflurry: remove nose dependency

This package is currently broken anyway, but I have sent an untested
PR upstream to migrate their tests to pytest in the hopes that it
will be merged by the time we can build this again. If we fix the
package before the PR is merged, hopefully we can use it as a basis
for a vendored patch.

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

@@ -44,8 +44,9 @@ buildPythonPackage rec {
     tqdm
   ];
 
+  # Tests currently depend on nose; see
+  # <https://github.com/openvax/mhcflurry/pull/244>.
   nativeCheckInputs = [
-    nose
     pytestCheckHook
   ];