Environment

• deptry version: 0.16.1
• Python version: 3.11
• Operating system (e.g. Ubuntu 22.04, Windows 11): Mac OS 14.0

Describe the issue

I have a project which has django-cms in its requirements.txt, and I import those packages depend on django-cms like django-classy-tags, django-formtools... those should be detected as a transitive dependency, but it seems deptry can't recognize those with a - packages's name, so it turns out detected as a missing dependency.

Minimal way to reproduce the issue

1. Have a new project with django-cms in the requirements, and install in a conda environment
2. In project
   import classytags
   from formtools.wizard.views import WizardView
   import sekizai
   from treebeard.mp_tree import MP_Node
   from packaging import version
3. python -m deptry .

those with - will be detected as DEP001 incorrectly, but without dash's package can be detected as transitive successfully.