Update django-oauth-toolkit requirement from ==2.3.* to ==3.1.*

Updates the requirements on [django-oauth-toolkit](https://github.com/django-oauth/django-oauth-toolkit) to permit the latest version.
- [Release notes](https://github.com/django-oauth/django-oauth-toolkit/releases)
- [Changelog](https://github.com/django-oauth/django-oauth-toolkit/blob/master/CHANGELOG.md)
- [Commits](https://github.com/django-oauth/django-oauth-toolkit/compare/2.3.0...3.1.0)

---
updated-dependencies:
- dependency-name: django-oauth-toolkit
  dependency-version: 3.1.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

pyproject.toml

@@ -48,7 +48,7 @@ dependencies = [
   "django-libsass==0.9",
   "django-localflavor==5.0",
   "django-markup",
-  "django-oauth-toolkit==2.3.*",
+  "django-oauth-toolkit==3.1.*",
   "django-otp==1.6.*",
   "django-phonenumber-field==7.3.*",
   "django-redis==6.0.*",