Remove namespace warning

[holtgrewe]

The following namespace warning occurs when running tests. One probably has to migrate to "new style namespaces". The matplotlib library has a similar issue albeit not resolved this yet.

============================================================================================================================== warnings summary ===============================================================================================================================
../../../../opt/miniconda3/envs/seqrepo/lib/python3.8/site-packages/pkg_resources/__init__.py:121
../../../../opt/miniconda3/envs/seqrepo/lib/python3.8/site-packages/pkg_resources/__init__.py:121
  /opt/miniconda3/envs/seqrepo/lib/python3.8/site-packages/pkg_resources/__init__.py:121: DeprecationWarning: pkg_resources is deprecated as an API
    warnings.warn("pkg_resources is deprecated as an API", DeprecationWarning)

../../../../opt/miniconda3/envs/seqrepo/lib/python3.8/site-packages/biocommons/__init__.py:3
../../../../opt/miniconda3/envs/seqrepo/lib/python3.8/site-packages/biocommons/__init__.py:3
  /opt/miniconda3/envs/seqrepo/lib/python3.8/site-packages/biocommons/__init__.py:3: DeprecationWarning: Deprecated call to `pkg_resources.declare_namespace('biocommons')`.
  Implementing implicit namespace packages (as specified in PEP 420) is preferred to `pkg_resources.declare_namespace`. See https://setuptools.pypa.io/en/latest/references/keywords.html#keyword-namespace-packages
    pkg_resources.declare_namespace(__name__)

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html

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