Bump python-ldap from 3.0.0 to 3.2.0 in /cvat/requirements (#1706)

Bumps [python-ldap](https://github.com/python-ldap/python-ldap) from 3.0.0 to 3.2.0.
- [Release notes](https://github.com/python-ldap/python-ldap/releases)
- [Commits](https://github.com/python-ldap/python-ldap/compare/python-ldap-3.0.0...python-ldap-3.2.0)

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

@@ -8,7 +8,7 @@ django-rq==2.0.0
 EasyProcess==0.2.3
 Pillow==7.1.2
 numpy==1.16.2
-python-ldap==3.0.0
+python-ldap==3.2.0
 pytz==2018.3
 pyunpack==0.1.2
 rcssmin==1.0.6