Bump scipy from 1.2.1 to 1.4.1 in /cvat/requirements (#1678)

Bumps [scipy](https://github.com/scipy/scipy) from 1.2.1 to 1.4.1.
- [Release notes](https://github.com/scipy/scipy/releases)
- [Commits](https://github.com/scipy/scipy/compare/v1.2.1...v1.4.1)

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

@@ -17,7 +17,7 @@ requests==2.23.0
 rjsmin==1.0.12
 rq==1.0.0
 rq-scheduler==0.9.1
-scipy==1.2.1
+scipy==1.4.1
 sqlparse==0.2.4
 django-sendfile==0.3.11
 dj-pagination==2.4.0