Add test on blocking due to PDL penalty #253

Job	Run time
Tox test (py38)	2m 49s
Tox test (py39)	2m 53s
Tests on paywalled platforms	0s
Tests on other platforms (windows-2019, 3.10)	3m 49s
Tox test (py310)	2m 52s
Tests on other platforms (windows-2022, 3.11)	3m 10s
Tox test (py311)	2m 38s
Tests on other platforms (windows-2022, 3.12)	3m 6s
Tox test (py312-cover)	5m 30s
Tests on other platforms (macos-12, 3.11)	2m 32s
Tox test (docs, graphviz)	1m 47s
Tests on other platforms (macos-13, 3.12)	3m 0s
Docker image	0s
PyPI packaging	0s
	34m 6s

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