ci: pin setuptools to 65.6.2

setuptools 65.6.3 breaks tox. Pin to 65.6.2 until it gets fixed.

Author: apotterri

.travis.yml

@@ -10,7 +10,7 @@ python:
 # https://github.com/travis-ci/travis-ci/issues/1147#issuecomment-441393807
 if: type != push OR branch = master OR branch =~ /^v\d+\.\d+(\.\d+)?(-\S*)?$/
 
-before_install: pip install --upgrade pip setuptools
+before_install: pip install --upgrade pip setuptools==65.6.2
 install: pip install tox-travis
 script: tox