Hello Guix,

I see strange conflicts when trying to update packages via manifest:

guix package: error: profile contains conflicting entries for python-cffi
guix package: error:   first entry: python-cffi@1.15.0 /gnu/store/fnkn12qv3bw7z3jhdgp2drd0nnn0p433-python-cffi-1.15.0
guix package: error:    ... propagated from python-cmarkgfm@0.7.0
guix package: error:    ... propagated from python-readme-renderer@32.0
guix package: error:    ... propagated from python-twine@1.15.0
guix package: error:   second entry: python-cffi@1.14.4 /gnu/store/4zz00w8rqrfazv5lsjajs0g8y04ysa8g-python-cffi-1.14.4
guix package: error:    ... propagated from python-cryptography@3.3.1
guix package: error:    ... propagated from python-pyopenssl@20.0.1
guix package: error:    ... propagated from python-urllib3@1.26.7
guix package: error:    ... propagated from python-requests@2.26.0
guix package: error:    ... propagated from python-requests-toolbelt@0.9.1
guix package: error:    ... propagated from python-twine@1.15.0


As you can see, both packages are python-twine, and they have
conflicting dependencies.

I attached both my manifest and my channels file.

To reproduce:


    LANG=C guix package -kK --fallback -m ~/fluss-guix.manifest


$ LANG=C guix describe
Generation 377	Feb 07 2022 10:35:27	(current)
  guix c6b407c
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: c6b407c923253ac3e7ce8439b31f52ef94de7846
  flat ece373b
    repository URL: https://github.com/flatwhatson/guix-channel.git
    branch: master
    commit: ece373bcd1e00ef746fb7b104e56ab610cc4af2a