Bump pylint-django from 2.0.15 to 2.1.0 in /cvat/requirements (#1888)

Bumps [pylint-django](https://github.com/PyCQA/pylint-django) from 2.0.15 to 2.1.0.
- [Release notes](https://github.com/PyCQA/pylint-django/releases)
- [Changelog](https://github.com/PyCQA/pylint-django/blob/master/CHANGELOG.rst)
- [Commits](pylint-dev/pylint-django@v2.0.15...v2.1.0)

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

cvat/requirements/development.txt

@@ -4,7 +4,7 @@ isort==4.3.21
 lazy-object-proxy==1.5.0
 mccabe==0.6.1
 pylint==2.5.3
-pylint-django==2.0.15
+pylint-django==2.1.0
 pylint-plugin-utils==0.6
 rope==0.17.0
 wrapt==1.12.1