Django-oscar

- [Important] Fix bug causing order lines to get deleted is the corresponding basket or basket line is deleted.

- Handle bug occurring when a basket contained a zero-quantity line item.

- Upgrade dependencies.

Fix

- **deps**: update dependency phonenumbers to ^8.13.44
- **deps**: update dependency tslib to ^2.7.0
- **deps**: update dependency core-js to ^3.38.1
- **deps**: update dependency phonenumbers to ^8.13.43
- **deps**: update dependency django to ^4.2.15

Fix

- **deps**: update dependency core-js to ^3.38.0
- **deps**: update dependency phonenumbers to ^8.13.42
- **deps**: update dependency fp-ts to ^2.16.9
- **deps**: update dependency django to ^4.2.14
- **deps**: update dependency tslib to ^2.6.3
- **deps**: update dependency fp-ts to ^2.16.8
- **deps**: update dependency regenerator-runtime to ^0.14.1
- **deps**: update dependency react-select to ^5.8.0
- **deps**: update dependency react-modal to ^3.16.1
- **deps**: update dependency phonenumbers to ^8.13.40
- **deps**: update dependency lunr to ^2.3.9
- **deps**: update dependency js-cookie to ^3.0.5
- **deps**: update dependency io-ts to ^2.2.21
- **deps**: update dependency fp-ts to ^2.16.7
- **deps**: update dependency django to ^4.2.13
- **deps**: update dependency core-js to ^3.37.1
- **deps**: update dependency classnames to ^2.5.1
- **deps**: update dependency phonenumbers to v8.13.39
- **deps**: update dependency phonenumbers to v8.13.38
- **deps**: update dependency tslib to v2.6.3
- **deps**: update dependency react-select to v5.8.0
- **deps**: update dependency regenerator-runtime to ^0.14.0
- **deps**: update dependency fp-ts to v2.16.6
- **deps**: update dependency core-js to v3.37.1
- **deps**: update dependency classnames to v2.5.1
- **deps**: update dependency phonenumbers to v8.13.37
- **deps**: update dependency js-cookie to v3.0.5
- **deps**: update dependency io-ts to v2.2.21
- **deps**: update dependency django-oscar to v3.2.4
- **deps**: update dependency django to v4.2.13

===

* Declare support for Oscar 2.1 and Django 3.0.
* Drop support for Django 1.11.
* Drop support for Python 3.5.