Ignore new deprecation message from setuptools.

[tjni]

In setuptools 67.5.0+, a new DeprecationWarning is emitted whenever pkg_resources is imported, which we need to ignore during tests.

I am creating this patch to use in nixpkgs, as I am updating setuptools there. I'm going to close this PR as I don't want to read or sign a CLA (indeed, I don't remember if I have in the past). Feel free to use it or not use it as you see fit.

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