WIP: Compatibility with EmPy 4 #537

Job	Run time
bootstrap / setup	5s
pytest / setup	3s
pytest / pytest (macos-latest, 3.8)	1m 17s
pytest / pytest (macos-latest, 3.9)	50s
pytest / pytest (macos-latest, 3.10)	48s
pytest / pytest (macos-latest, 3.11)	55s
pytest / pytest (macos-latest, 3.12)	50s
pytest / pytest (ubuntu-latest, 3.8)	1m 32s
pytest / pytest (ubuntu-latest, 3.9)	3m 11s
pytest / pytest (ubuntu-latest, 3.10)	2m 4s
pytest / pytest (ubuntu-latest, 3.11)	1m 56s
pytest / pytest (ubuntu-latest, 3.12)	1m 37s
pytest / pytest (windows-latest, 3.8)	1m 50s
pytest / pytest (windows-latest, 3.9)	1m 55s
pytest / pytest (windows-latest, 3.10)	2m 25s
pytest / pytest (windows-latest, 3.11)	1m 56s
pytest / pytest (windows-latest, 3.12)	2m 23s
pytest / pytest (ubuntu-20.04, 3.6)	1m 7s
bootstrap / bootstrap (macos-latest, 3.8)	1s
bootstrap / bootstrap (macos-latest, 3.9)	1s
bootstrap / bootstrap (macos-latest, 3.10)	1s
bootstrap / bootstrap (macos-latest, 3.11)	6s
bootstrap / bootstrap (macos-latest, 3.12)	1s
bootstrap / bootstrap (ubuntu-latest, 3.8)	1s
bootstrap / bootstrap (ubuntu-latest, 3.9)	1s
bootstrap / bootstrap (ubuntu-latest, 3.10)	53s
bootstrap / bootstrap (ubuntu-latest, 3.11)	48s
bootstrap / bootstrap (ubuntu-latest, 3.12)	1m 6s
bootstrap / bootstrap (windows-latest, 3.8)	1s
bootstrap / bootstrap (windows-latest, 3.9)	1s
bootstrap / bootstrap (windows-latest, 3.10)	1s
bootstrap / bootstrap (windows-latest, 3.11)	1s
bootstrap / bootstrap (windows-latest, 3.12)	1s
bootstrap / bootstrap (ubuntu-20.04, 3.6)	54s
	30m 42s

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