Update dulwich to 0.19.12

[pyup-bot]

This PR updates dulwich from 0.19.11 to 0.19.12.

The bot wasn't able to find a changelog for this release. Got an idea?

Links

• PyPI: https://pypi.org/project/dulwich
• Changelog: https://pyup.io/changelogs/dulwich/
• Homepage: https://www.dulwich.io/

[codecov]

Codecov Report

Merging #1049 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1049   +/-   ##
======================================
  Coverage     100%    100%           
======================================
  Files          13      13           
  Lines         606     606           
  Branches       12      12           
======================================
  Hits          606     606

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[pyup-bot]

Closing this in favor of #1053