Updating packages with non canonical names errors out

[Kroppeb]

Seems related to #6056

Running pipenv update some_cool_package_name will error out. When using verbose mode the following error can be found:

CRITICAL:pipenv.patched.pip._internal.resolution.resolvelib.factory:Cannot install some_cool_package_name because these package versions have conflicting dependencies.
INFO:pipenv.patched.pip._internal.resolution.resolvelib.factory:
The conflict is caused by:
    The user requested some_cool_package_name
    The user requested (constraint) some_cool_package_name

[Kroppeb]

I suppose this is also an example for #6091 and #6090

[matteius]

I think when I removed requirementslib I broke something with canonical naming, and I could use help figuring out the right patch. There was this, but apparently its still an issue? #6057