python3{11,12}Packages.pytest_7: drop nose dependency

This was only used for testing pytest itself in
`passthru.tests.pytest`. The tests weren’t passing before this,
so I can’t verify if they still pass after, but looking over the
source tree it would just be a matter of disabling a file at most if
this breaks them further.

pkgs/development/python-modules/pytest/7.nix

@@ -22,7 +22,6 @@
   argcomplete,
   hypothesis,
   mock,
-  nose,
   pygments,
   requests,
   xmlschema,
@@ -66,7 +65,6 @@ let
         attrs
         hypothesis
         mock
-        nose
         pygments
         requests
         setuptools