fix ldap3 requirements
fix ldap3 requirements

ldap3 0.9.8.4 is not available on pypi anymore.
Adapted the requirements.txt according to setup.py

jh23453/privacyidea,wheldom01/privacyidea,wheldom01/privacyidea,wheldom01/privacyidea,privacyidea/privacyidea,jh23453/privacyidea,privacyidea/privacyidea,wheldom01/privacyidea,wheldom01/privacyidea,jh23453/privacyidea,privacyidea/privacyidea,wheldom01/privacyidea,jh23453/privacyidea,jh23453/privacyidea,privacyidea/privacyidea,jh23453/privacyidea,privacyidea/privacyidea,privacyidea/privacyidea