Update requirements.txt with pipenv

Author: Daniel Berteaud

requirements.txt

@@ -29,10 +29,10 @@ constantly==15.1.0
 cryptography==3.4.7
 daphne==3.0.2; python_version >= '3.6'
 dateparser==1.0.0
+django-auth-ldap==3.0.0
 django-cors-headers==3.8.0
 django-extensions==3.1.3
 django-filter==2.4.0
-django-auth-ldap
 django-picklefield==3.0.1; python_version >= '3'
 django-q==1.3.9
 django==3.2.6