Specify Python Version Range in Pipfile

[Semnodime]

Issue description

[requires]
python_version = ">=3.12"

Expected result

Choose the latest python version available on the system to satisfy the constraints or raise the constraint error.

Actual result

Warning: Python >=3.12 was not found on your system...
Neither 'pyenv' nor 'asdf' could be found to install Python.

Steps to replicate

pipenv --python 3.12
# Change last line in Pipfile to `python_version = ">=3.12"`
pipenv --rm
pipenv --install

[matteius]

Only absolute values are supported, and when upgrading python versions virtualenvs need to be recreated.

[Semnodime]

Only absolute values are supported, and when upgrading python versions virtualenvs need to be recreated.

Correct. That's what I observed. This is a bug since the rest of the Pipfile uses the same version specifiers and pipenv --install does not communicate that only absolute values are supported and a range has been specified.
I acknowledge that one could conclude that from the pipenv error, but IMHO it'd be better to signal this parsing constraint explicitly along the error message.

[sanspareilsmyn]

@Semnodime @matteius I'd love to handle this issue. I'll send a PR to fix this in near future.

[matteius]

@sanspareilsmyn I think I have it solved in my open PR that fixes a number of issues -- if either of you or @Semnodime can check out this branch: #6282 and give it a whirl.