CI: Remove pipenv test, pipenv was retired from Rawhide

https://src.fedoraproject.org/rpms/pipenv/c/892789a4d91e00f80f7ebc2a187d51038b7b5223

tests/tests.yml

@@ -61,8 +61,6 @@
     - smoke312_virtualenv:
         dir: python/smoke
         run: VERSION=3.12 METHOD=virtualenv ./venv.sh
-    - pipenv:
-        run: pipenv install six
     - pyproject_pytest:
         dir: pyproject-rpm-macros/tests
         run: ./mocktest.sh python-pytest
@@ -89,7 +87,6 @@
     - python2-devel
     - python3-devel
     - python3-tox
-    - pipenv
     - mock
     - rpmdevtools
     - rpm-build