chore(deps): update slackapi/slack-github-action action to v1.27.1 #867

Job	Run time
black	2m 35s
mypy	40s
pydocstyle	24s
bandit	18s
flake8	21s
yamllint	21s
pylint	42s
unittest (3.8, 2.x)	3m 5s
unittest (3.9, 2.x)	59s
unittest (3.10, 2.x)	2m 54s
unittest (3.11, 2.x)	38s
unittest (3.11, 1.x)	2m 51s
Push Package to PyPI	0s
Publish to GitHub	0s
Send notification to the Slack	0s
	15m 48s

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