Review requirements at https://github.com/philips-software/license-scanner/blob/b590ea0985c83daab0a913c1d3c4e2eb34a87d9f/docker/requirements.txt

See https://github.com/philips-software/license-scanner/blob/b590ea0985c83daab0a913c1d3c4e2eb34a87d9f/docker/requirements.txt

@JeroenKnoops commented yesterday https://github.com/oss-review-toolkit/ort/pull/3613#issuecomment-777057402

> I needed Scancode for a project as well.
>
> I had some troubles when using the requirements.txt above, so I've installed the full scancode pip package and did a `pip freeze` and use that for the future installations.
>
> Now its dependency versions are fixed and it's running in python 3.9.
>
> See: https://github.com/philips-software/license-scanner/pull/48/files

The task consist in reviewing the requirements and why the standard ones were not working there.