Bump sqlparse from 0.2.4 to 0.3.1 in /cvat/requirements (#1778)

Bumps [sqlparse](https://github.com/andialbrecht/sqlparse) from 0.2.4 to 0.3.1.
- [Release notes](https://github.com/andialbrecht/sqlparse/releases)
- [Changelog](https://github.com/andialbrecht/sqlparse/blob/master/CHANGELOG)
- [Commits](https://github.com/andialbrecht/sqlparse/compare/0.2.4...0.3.1)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

cvat/requirements/base.txt

@@ -18,7 +18,7 @@ requests==2.24.0
 rq==1.0.0
 rq-scheduler==0.10.0
 scipy==1.4.1
-sqlparse==0.2.4
+sqlparse==0.3.1
 django-sendfile==0.3.11
 dj-pagination==2.4.0
 python-logstash==0.4.6