community/py3-django-auth-ldap: upgrade to 5.0.0

https://github.com/django-auth-ldap/django-auth-ldap/releases/tag/5.0.0

Breaking changes:

An LDAPError during an LDAP search operation would cause the library to assume an empty result set.
When mirroring groups, only a portion of a user groups would be mirrored. Allowing them to proceed with authentication may then break application access controls, as membership to a group (imagine an exclude group) would be missing.

The library now systematically sends the ldap_error django signal. If an LDAPError occurs during an operation, the operation is aborted. In particular, when mirroring groups (LDAPUser._mirror_groups), an AuthenticationFailed might now be raised.

See #378 for details.