chore(setuptools): limit setuptools version to avoid issue with 2to3

Note: We need this because before CW 3.34, we use rdflib 5 and rdflib-jsonld
which use 2to3.

see: https://setuptools.readthedocs.io/en/stable/history.html#v58-0-0

--HG--
branch : 3.31

MANIFEST.in

@@ -4,6 +4,7 @@ include COPYING.LESSER
 include pylintrc
 include jshintrc
 include tox.ini
+include pyproject.toml
 exclude .gitlab-ci.yml
 exclude .yamllint
 prune .gitlab

pyproject.toml

+[build-system]
+requires = [
+    "setuptools < 58.0.0",
+    "wheel"
+]