Fix typing with dulwich >= 0.21.4.0
_parse_message
has a return type annotation since
https://github.com/jelmer/dulwich/commit/a8df40933d5fbde613b6019c6e7eb4606756ea06
I also submitted a fix to dulwich: https://github.com/jelmer/dulwich/pull/1176
_parse_message
has a return type annotation since
https://github.com/jelmer/dulwich/commit/a8df40933d5fbde613b6019c6e7eb4606756ea06
I also submitted a fix to dulwich: https://github.com/jelmer/dulwich/pull/1176