chore(python-deps): update dependency pypi-simple to v1.6.0 for actions/create_unique_testpypi_version and actions/update_development_dependencies #234

Job	Run time
test-create_unique_testpypi_version	13s
test-find_unreleased_changelog_items	29s
test-update_development_dependencies	1m 30s
test-fetch_pr_number	14s
check-action-tests-passed	2s
	2m 28s

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