Bump django-oauth-toolkit from 1.6.3 to 2.3.0

Bumps [django-oauth-toolkit](https://github.com/jazzband/django-oauth-toolkit) from 1.6.3 to 2.3.0.
- [Release notes](https://github.com/jazzband/django-oauth-toolkit/releases)
- [Changelog](https://github.com/jazzband/django-oauth-toolkit/blob/master/CHANGELOG.md)
- [Commits](jazzband/django-oauth-toolkit@1.6.3...2.3.0)

---
updated-dependencies:
- dependency-name: django-oauth-toolkit
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>