Bump django-sendfile2 from 0.6.1 to 0.7.0 in /cvat/requirements (#99)

Bumps [django-sendfile2](https://github.com/moggers87/django-sendfile2) from 0.6.1 to 0.7.0.
- [Release notes](https://github.com/moggers87/django-sendfile2/releases)
- [Changelog](https://github.com/moggers87/django-sendfile2/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/moggers87/django-sendfile2/compare/v0.6.1...v0.7.0)

---
updated-dependencies:
- dependency-name: django-sendfile2
  dependency-type: direct:production
...

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cvat/requirements/base.txt

@@ -18,7 +18,7 @@ requests==2.26.0
 rq==1.5.1
 rq-scheduler==0.10.0
 sqlparse==0.4.2
-django-sendfile2==0.6.1
+django-sendfile2==0.7.0
 dj-pagination==2.5.0
 python-logstash-async==2.2.0
 rules==2.2