Add a way to ignore the pyproject.toml and only use the requirements.txt

[tgonzalez89]

Is your feature request related to a problem? Please describe.

It's impossible to make the tool only check the dependencies in the requirements.txt if a pyproject.toml exists. The tool enforces the order defined in https://deptry.com/usage/#dependencies-extraction

Describe the solution you would like

An option to prioritize the requirements.txt over the pyproject.toml or to ignore the pyproject.toml altogether. Maybe an option force-select one of the options defined in https://deptry.com/usage/#dependencies-extraction, this would be an even more generic solution.

Additional context

NA