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See: dulwich issue 1093.
Note that with our current version of dulwich (0.20.24) this seems to build dulwich with C bindings. For testing this is suboptimal but not critical (it's unlikely that dulwich's behaviour differs depending on whether the C bindings are used or not). (It will be critical for building crowd_anki, though.)
Hence, I've upgraded dulwich.
Fetch dependencies script will also need updating.