Django-payments-payu

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* fix "AttributeError: Manager isn't accessible via Payment instances" introduced in 1.4.1

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* fix multiple deduction of the refund amount from `payment.captured_amount`
* change statuses of payments refunded with an amount greater than `payment.captured_amount` to `REFUNDED` instead of just deducing `captured_amount`

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* fix captured_amount not being saved when processing data

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* fix backward compatibility by making PayuProvider's get_refund_description argument optional
* add `renewal_triggered_by` parameter to `payment.set_renew_token`
* make PayuProvider.refund fail if get_refund_description is not provided
* make PayuProvider.refund raise PayuApiError if an unexpected response is received
* deprecate the default value of get_refund_description; set it to a callable instead
* deprecate `automatic_renewal` parameter of `payment.set_renew_token`; use `renewal_triggered_by` parameter instead
* deprecate `None` value of `renewal_triggered_by` parameter of `payment.set_renew_token`; set `"user"`/`"task"`/`"other"` instead

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* Fix description on PyPI

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* add get_refund_description and get_refund_ext_id arguments to PayuProvider
* add PayuProvider.refund
* update payment.captured_amount only when order is completed
* subtract refunds from payment.captured_amount rather than from payment.total
* rename PayuProvider.payu_api_order_url to payu_api_orders_url
* tests for Django 2.2-5.0 Python 3.7-3.12