Log Message:
py-ldap3: updated to 2.9

2.9:
- new feature: SafeRestartable strategy (SAFE_RESTARTABLE) for using a \ 
restartable Connection object in a multi-threading program
- tested against Python 3.9
- added requirements-dev.txt
- fixed logging unicode exceptions in python2.7
- added more granular control over use of reverse dns with Kerberos (thanks Azaria)
- support MS Active Directory persistent search (thanks eLeX)
- added support for LDAP signing when using DIGEST-MD5 authentication (thanks \ 
Augustin-FL)
- check only for searchResEntries in LDIF conversion (thanks Jay)
- modify-increment now works properly in mock strategies (thanks Saint-Marcel)
- objectGUID are now converted properly (thanks Janne)
- default timeout in asynchronous strategies raised to 20 seconds