breaking pkg_resources usage

[guruofgentoo]

pkg_resources usage is deprecated in setuptools==67.5.0:

.tempenv/lib/python3.10/site-packages/formencode/__init__.py:3: in <module>
    from pkg_resources import get_distribution, DistributionNotFound
.tempenv/lib/python3.10/site-packages/pkg_resources/__init__.py:121: in <module>
    warnings.warn("pkg_resources is deprecated as an API", DeprecationWarning)

Actually, as of setuptools==67.3.1, we begin getting deprecation warnings depending on other packages installed.

.tox/py310/lib/python3.10/site-packages/formencode/__init__.py:3: in <module>
    from pkg_resources import get_distribution, DistributionNotFound
.tox/py310/lib/python3.10/site-packages/pkg_resources/__init__.py:3258: in <module>
    def _initialize_master_working_set():
.tox/py310/lib/python3.10/site-packages/pkg_resources/__init__.py:3232: in _call_aside
    f(*args, **kwargs)
.tox/py310/lib/python3.10/site-packages/pkg_resources/__init__.py:3283: in _initialize_master_working_set
    tuple(dist.activate(replace=False) for dist in working_set)
.tox/py310/lib/python3.10/site-packages/pkg_resources/__init__.py:3283: in <genexpr>
    tuple(dist.activate(replace=False) for dist in working_set)
.tox/py310/lib/python3.10/site-packages/pkg_resources/__init__.py:2804: in activate
    declare_namespace(pkg)
.tox/py310/lib/python3.10/site-packages/pkg_resources/__init__.py:2298: in declare_namespace
    warnings.warn(msg, DeprecationWarning, stacklevel=2)
E   DeprecationWarning: Deprecated call to `pkg_resources.declare_namespace('google')`.
E   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

Can we change how the version number is defined in formencode to resolve this?