oss ydb: fix dstool building and test run

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diff --git a/contrib/deprecated/python/singledispatch/README.rst b/contrib/deprecated/python/singledispatch/README.rst
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+.. image:: https://img.shields.io/pypi/v/singledispatch.svg
+   :target: `PyPI link`_
+
+.. image:: https://img.shields.io/pypi/pyversions/singledispatch.svg
+   :target: `PyPI link`_
+
+.. _PyPI link: https://pypi.org/project/singledispatch
+
+.. image:: https://github.com/jaraco/singledispatch/workflows/tests/badge.svg
+   :target: https://github.com/jaraco/singledispatch/actions?query=workflow%3A%22tests%22
+   :alt: tests
+
+.. image:: https://img.shields.io/badge/code%20style-black-000000.svg
+   :target: https://github.com/psf/black
+   :alt: Code style: Black
+
+.. .. image:: https://readthedocs.org/projects/skeleton/badge/?version=latest
+..    :target: https://skeleton.readthedocs.io/en/latest/?badge=latest
+
+.. image:: https://img.shields.io/badge/skeleton-2021-informational
+   :target: https://blog.jaraco.com/skeleton
+
+`PEP 443 <http://www.python.org/dev/peps/pep-0443/>`_ proposed to expose
+a mechanism in the ``functools`` standard library module in Python 3.4
+that provides a simple form of generic programming known as
+single-dispatch generic functions.
+
+This library is a backport of this functionality and its evolution.
+
+Refer to the `upstream documentation
+<http://docs.python.org/3/library/functools.html#functools.singledispatch>`_
+for API guidance. To use the backport, simply use
+``from singledispatch import singledispatch, singledispatchmethod`` in place of
+``from functools import singledispatch, singledispatchmethod``.
+
+
+
+Maintenance
+-----------
+
+This backport is maintained on Github by Jason R. Coombs, one of the
+members of the core CPython team:
+
+* `repository <https://github.com/jaraco/singledispatch>`_
+
+* `issue tracker <https://github.com/jaraco/singledispatch/issues>`_