release: merge back stable branch into default

pkgs: upgrade dulwich to 0.13 - fixes #4009

release: remove newline from version file

merged back stable into default

Added tag v4.1.2 for changeset f38ed1e1a31d

release: Finish preparation for 4.1.2

release: updated pip2nix output for 4.1.2

release: Start preparation for 4.1.2

Added tag v4.1.1 for changeset 49aa7ed030a3

bumpversion: from 4.1.0 to 4.1.1