More CI fixes (#208)

* Remove bandit from CI, update poetry.lock&pre-commit-config.yaml

* We don't support python 3.6

* poetry install also on tests flow

* remove pytest-azurepipelines

pyproject.toml

@@ -26,7 +26,6 @@ sphinxcontrib-programoutput = { version = "^0", optional = true }
 
 [tool.poetry.dev-dependencies]
 pytest = "^5"
-pytest-azurepipelines = "^0"
 pytest-cov = "^2"
 pytest-asyncio = "^0"
 pytest-sugar = "*"