python3Packages.hg-git: fix build failure
the dulwich version we are using is ahead of the one used upstream by hg-git.
the build was failing because it could not import 'ANNOTATED_TAG_SUFFIX' from
'dulwich.refs'.
- dulwich renamed `ANNOTATED_TAG_SUFFIX` to `PEELED_TAG_SUFFIX` in [2ef900fa](https://github.com/jelmer/dulwich/commit/2ef900fa)
- dulwich moved `PEELED_TAG_SUFFIX` to `dulwich.protocol` in [abdb24e2](https://github.com/jelmer/dulwich/commit/abdb24e2)
