Fix the version output

[matteius]

Before:

matteius@matteius-VirtualBox:~/pipenv$ pipenv --version
pipenv
, version 2023.8.19

After:

matteius@matteius-VirtualBox:~/pipenv$ pipenv --version
pipenv, version 2023.8.19

The issue

We broke the benchmark run because unexpectedly the version output changed formats:.
https://github.com/lincolnloop/python-package-manager-shootout/actions/runs/5914571940/job/16040022277

The checklist

• Associated issue
• A news fragment in the news/ directory to describe this fix with the extension .bugfix.rst, .feature.rst, .behavior.rst, .doc.rst. .vendor.rst. or .trivial.rst (this will appear in the release changelog). Use semantic line breaks and name the file after the issue number or the PR #.

[oz123]

LGTM