Update networktocode/gh-action-setup-poetry-environment action to v6 #984

Job	Run time
black	26s
flake8	25s
bandit	20s
pydocstyle	25s
mypy	31s
yamllint	23s
pylint	32s
unittest (3.9, 2.x)	39s
unittest (3.10, 2.x)	32s
unittest (3.11, 2.x)	30s
unittest (3.12, 2.x)	26s
unittest (3.11, 1.x)	34s
Publish to GitHub	0s
Push Package to PyPI	0s
Send notification to the Slack	0s
	5m 43s

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