Dulwich

* Add basic support for a GcsObjectStore that stores
pack files in gcs. (Jelmer Vernooij)

* In porcelain.push, default to local active branch.
(Jelmer Vernooij, 846)

* Support fetching symrefs.
(Jelmer Vernooij, 485, 847)

* Add aarch64 wheel building.
(odidev, Jelmer Vernooij)

* Implement ``Stash.drop``. (Peter Rowlands)

* Support untracked symlinks to paths outside the
repository. (Peter Rowlands, 842)

* Fix handling of negative matches in nested gitignores.
(Corentin Hembise, 836)

* Fix formatting in setup.py. (Jelmer Vernooij)

* Add release configuration. (Jelmer Vernooij)

* credentials: ignore end-of-line character. (Georges Racinet)

* Fix failure in get_untracked_paths when the repository contains symlinks.
(830, 793, mattseddon)

* docs: Clarify that Git objects are created on `git add`.
(Utku Gultopu)

* Add flag to only attempt to fetch ignored untracked files when specifically requested.
(Matt Seddon)