ci: update tox-poetry-installer

See enpaul/tox-poetry-installer#70

tox.ini

@@ -15,7 +15,7 @@ envlist = clean,lint,py310,py39,py38,py37,docs,report
 requires =
     # Installing with "requires" even though it's not the recommended option
     # https://github.com/enpaul/tox-poetry-installer/#installing
-    tox-poetry-installer[poetry] == 0.8.0
+    tox-poetry-installer[poetry] >= 0.9.0
 
 [testenv]
 description = Run tests with pytest and coverage