Bump python-ldap from 3.1.0 to 3.4.0

Bumps [python-ldap](https://github.com/python-ldap/python-ldap) from 3.1.0 to 3.4.0.
- [Release notes](https://github.com/python-ldap/python-ldap/releases)
- [Commits](python-ldap/python-ldap@python-ldap-3.1.0...python-ldap-3.4.0)

---
updated-dependencies:
- dependency-name: python-ldap
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

setup.py

@@ -51,7 +51,7 @@
         'beaker',
         'cryptography==3.2',
         'webassets',
-        'python-ldap==3.1.0',
+        'python-ldap==3.4.0',
         'exchangelib==2.2.0',
         'setproctitle',
         'pyfcm==1.4.3',