Log Message:
py-dulwich: updated o 0.21.3

0.21.3  2023-02-17

 * Add support for ``worktreeconfig`` extension.
   (Jelmer Vernooij)

 * Deprecate ``Commit.extra``; the Git project specifically
   discourages adding custom lines, and the contents of
   ``Commit.extra`` are unpredictable as contents
   may be different between different versions of Dulwich
   with support for different headers.

   ``Commit._extra`` still exists.
   (Jelmer Vernooij)

0.21.2  2023-01-18

 * Fix early file close bug in ``dulwich.pack.extend_pack``.
   (Jelmer Vernooij)

0.21.1  2023-01-17

 * Factor out ``dulwich.pack.extend_pack``.
   (Jelmer Vernooij)

0.21.0  2023-01-16

 * Pack internals have been significantly refactored, including
   significant low-level API changes.

   As a consequence of this, Dulwich now reuses pack deltas
   when communicating with remote servers, which brings a
   big boost to network performance.
   (Jelmer Vernooij)

 * Add 'pack-refs' command.
   (Dan Villiom Podlaski Christiansen)

 * Handle more errors when trying to read a ref
   (Dan Villiom Podlaski Christiansen)

 * Allow for reuse of existing deltas while creating pack files
   (Stefan Sperling)

 * cli: fix argument parsing for pack-objects --stdout
   (Stefan Sperling)

 * cli: open pack-objects output files in binary mode to avoid write() error
   (Stefan Sperling)

 * Bump minimum python version to 3.7. (Jelmer Vernooij)

 * honor no_proxy environment variable (afaul)

 * In HTTP Git Client, allow missing Content-Type.
   (Jelmer Vernooij)

 * Fix --pure builds (Jelmer Vernooij)

 * Allow passing abbrev to describe