Bump django-silk from 3.0.1 to 4.0.1 in /cvat/requirements (#1731)

Bumps [django-silk](https://github.com/jazzband/django-silk) from 3.0.1 to 4.0.1.
- [Release notes](https://github.com/jazzband/django-silk/releases)
- [Changelog](https://github.com/jazzband/django-silk/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jazzband/django-silk/compare/3.0.1...4.0.1)

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/staging.txt

@@ -1,2 +1,2 @@
 -r production.txt
-django-silk==3.0.1
+django-silk==4.0.1