Bump django-multifactor from 0.7.2 to 0.7.4 in /server

Bumps [django-multifactor](https://github.com/oliwarner/django-multifactor) from 0.7.2 to 0.7.4.
- [Release notes](https://github.com/oliwarner/django-multifactor/releases)
- [Commits](oliwarner/django-multifactor@v0.7.2...v0.7.4)

---
updated-dependencies:
- dependency-name: django-multifactor
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

server/requirements.txt

@@ -10,7 +10,7 @@ django-cors-headers==4.6.*
 django-decorator-include==3.2
 django-extensions==3.2.*
 django-formset-js-improved
-django-multifactor==0.7.2
+django-multifactor==0.7.4
 djangorestframework==3.15.*
 emoji==2.14.*
 icalendar==6.1.*