add python3-setuptools back to dpkg-list-ubuntu.txt

Author: mkocher

bosh-stemcell/spec/assets/dpkg-list-ubuntu.txt

@@ -458,6 +458,7 @@ python3-pkg-resources
 python3-pygments
 python3-pyparsing
 python3-rich
+python3-setuptools
 python3-software-properties
 python3-typeguard
 python3-typing-extensions