⬆️ Bump eventlet from 0.30.0 to 0.30.2 in /backend/uclapi (#3241)

Bumps [eventlet](https://github.com/eventlet/eventlet) from 0.30.0 to 0.30.2.
- [Release notes](https://github.com/eventlet/eventlet/releases)
- [Changelog](https://github.com/eventlet/eventlet/blob/master/NEWS)
- [Commits](eventlet/eventlet@v0.30.0...v0.30.2)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Ethan Wood <5961364+greenfrogs@users.noreply.github.com>

backend/uclapi/requirements.txt

@@ -12,7 +12,7 @@ django-mock-queries==2.1.5
 django-storages==1.11.1
 djangorestframework==3.12.2
 django-postgrespool2==1.0.1
-eventlet==0.30.0
+eventlet==0.30.2
 freezegun==1.1.0
 flake8==3.8.4
 gevent==21.1.2