Update networktocode/gh-action-setup-poetry-environment action to v6 #918

Job	Run time
black	25s
bandit	21s
mypy	30s
flake8	22s
pydocstyle	18s
yamllint	17s
pylint	38s
unittest (3.8, 2.x)	36s
unittest (3.9, 2.x)	38s
unittest (3.10, 2.x)	32s
unittest (3.11, 2.x)	33s
unittest (3.11, 1.x)	34s
Publish to GitHub	0s
Push Package to PyPI	0s
Send notification to the Slack	0s
	5m 44s

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