👽 Fix CI build - skip binary lxml

Per upstream docs: https://lxml.de/FAQ.html\#my-application-crashes

lxml should usually not be installed from binary wheel due to
the likelihood of a libxml2 mismatch. Installing with
--no-binary lxml ensures that lxml is built against the
system libraries.

tox.ini

@@ -29,6 +29,8 @@ deps =
   django32: Django~=3.2
   django41: Django~=4.1
   django42: Django~=4.2
+install_command =
+  python -I -m pip install {opts} --no-binary lxml {packages}
 commands =
   py.test tests \
    --cov --cov-report xml:reports/coverage-{envname}.xml \