Allowing use of dulwich 0.20 on Python 3
For the record, dulwich 0.20 dropped Python 2 support.
This instance will be updated to Heptapod 18.6.0rc1 on 2025-12-08 between 11:00 and 12:00 UTC+1 (Europe/Paris)
For the record, dulwich 0.20 dropped Python 2 support.