Set setup.py version to zero

I have no idea why the python community is so obsessed over breaking
things with version numbers they don't like, especially for things
that have no public interface and never need to be depended on.
Regardless, setuptools 67 breaks our test environment setup because
we don't have a compliant version number in our unreleased source
tree. So, just break setup.py's version apart from our actual version
and set it to zero. The build system stamps this to the right thing
in the distributions anyway.

setup.py

@@ -8,7 +8,7 @@
       description='A cross-platform cross-radio programming tool',
       packages=find_packages(include=["chirp*"]),
       include_package_data=True,
-      version=CHIRP_VERSION,
+      version=0,
       url='https://chirp.danplanet.com',
       python_requires=">=3.7,<4",
       install_requires=[