Remove Python 3.9 Support #1140

Job	Run time
validate_renovate	40s
black	24s
pydocstyle	21s
mypy	28s
yamllint	30s
bandit	31s
flake8	21s
build	1m 2s
pylint	1m 16s
unittest	0s
Push Package to PyPI	0s
Publish to GitHub	0s
Send notification to the Slack	-1s
	5m 32s

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