Bump django-stubs-ext from 0.7.0 to 0.8.0 (#828)

Bumps [django-stubs-ext](https://github.com/typeddjango/django-stubs) from 0.7.0 to 0.8.0.
- [Release notes](https://github.com/typeddjango/django-stubs/releases)
- [Commits](https://github.com/typeddjango/django-stubs/compare/[email protected])

---
updated-dependencies:
- dependency-name: django-stubs-ext
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -4,7 +4,7 @@ django-cors-headers==3.14.0
 djangorestframework==3.14.0
 djangorestframework-camel-case==1.4.2
 django-storages==1.13.2
-django-stubs-ext==0.7.0
+django-stubs-ext==0.8.0
 drf-yasg[validation]==1.21.5
 safe-eth-py[django]==5.1.0
 gunicorn==20.1.0