Remove old unnecessary workaround for towncrier

Author: abravalheri

tox.ini

@@ -54,8 +54,6 @@ extras =
 	doc
 	test
 changedir = docs
-deps =
-	importlib_resources < 6  # twisted/towncrier#528 (waiting for release)
 commands =
 	python -m sphinx -W --keep-going . {toxinidir}/build/html
 	python -m sphinxlint
@@ -67,7 +65,6 @@ deps =
 	towncrier
 	bump2version
 	jaraco.develop >= 7.23
-	importlib_resources < 6  # twisted/towncrier#528 (waiting for release)
 pass_env = *
 commands =
 	python tools/finalize.py