ci: integrate pytest-deprecated-warnings

tox.ini

@@ -3,7 +3,9 @@
 
 [testenv]
 sitepackages = True
-deps = -rrequirements-test.txt
+deps =
+  -rrequirements-test.txt
+  git+https://github.com/psycojoker/pytest-capture-deprecatedwarnings
 commands =
   {envpython} -c 'from logilab.common import pytest; pytest.run()' -t test {posargs}