[16.0][IMP] remove python libs included in odoo requirements

[CRogos]

same story as OCA/reporting-engine#865

https://github.com/odoo/odoo/blob/16.0/requirements.txt

[OCA-git-bot]

Hi @joao-p-marques, @sbidoul,
some modules you are maintaining are being modified, check this out!

[sbidoul]

This topic comes over and over again.

I have never seen a good justification to remove such dependencies.
And there is a good justification to keep them: they document that they are direct dependencies of the module.

See for instance OCA/queue#530 (comment) and the surrounding thread.

[CRogos]

@sbidoul Thanks you for sharing this link. It was very interesting to read and all arguments are already mentioned. I can understand both sites. I've added my comment there, to have it in the existing thread.