Changes

OBS: pyhss_download_deps: fix dependency loop

Fix that the Osmocom_OBS_nightly job is failing for the pyhss package
with a dependency loop in hatchling:

  LookupError: https://files.pythonhosted.org/…/hatchling-1.29.0.tar.gz (from https://pypi.org/simple/hatchling/) (requires-python:>=3.10) is already being built: hatchling>=1.21.0 from https://files.pythonhosted.org/…/hatchling-1.29.0.tar.gz

This happens as it recursively collects source packages and their
(build) dependencies:

  pymongo
  -> dnspython
  -> hatchling
  -> pluggy
  -> setuptools-scm
  -> vcs-versioning
  -> hatchling

When only ignoring the hatchling source package, we get a similar
dependency loop with pluggy, so ignore both source packages. Hatchling
gets added later as binary package and pluggy is only a build-time
dependency for hatchling. The resulting PyHSS package builds fine with
this change.

Change-Id: I0484627fd105627fabe9435379e704db54e72ae3