Travis: Downgrade to setuptools 59.6.0 to avoid error in 71.x #956
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There seems to be a well known error in setuptools 71.x that prevents installation of cpp-coveralls on Travis now:
File "/usr/local/lib/python3.10/dist-packages/setuptools/_core_metadata.py", line 285, in _distribution_fullname
TypeError: canonicalize_version() got an unexpected keyword argument 'strip_trailing_zero'
Fall back to the default version that is used in Ubuntu Jammy (59.6.0) since later versions also lead to the same error.
Link: pypa/setuptools#4483