Update dependency django-auth-ldap to v3

This MR contains the following updates:

Package	Type	Update	Change
django-auth-ldap	dependencies	major	^2.2 -> ^3.0

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Release Notes

django-auth-ldap/django-auth-ldap

v3.0.0

Compare Source

• Dropped support for Django 3.0.

Breaking changes ^^^^^^^^^^^^^^^^

• Dropped deprecated setting AUTH_LDAP_CACHE_GROUPS.
• Callables passed to AUTH_LDAP_SERVER_URI must now take a request positional argument.

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