WIP: Compatibility with EmPy 4 #539

Job	Run time
bootstrap / setup	5s
pytest / setup	5s
pytest / pytest (macos-latest, 3.8)	59s
pytest / pytest (macos-latest, 3.9)	44s
pytest / pytest (macos-latest, 3.10)	45s
pytest / pytest (macos-latest, 3.11)	41s
pytest / pytest (macos-latest, 3.12)	45s
pytest / pytest (ubuntu-latest, 3.8)	58s
pytest / pytest (ubuntu-latest, 3.9)	57s
pytest / pytest (ubuntu-latest, 3.10)	57s
pytest / pytest (ubuntu-latest, 3.11)	53s
pytest / pytest (ubuntu-latest, 3.12)	1m 0s
pytest / pytest (windows-latest, 3.8)	52s
pytest / pytest (windows-latest, 3.9)	48s
pytest / pytest (windows-latest, 3.10)	49s
pytest / pytest (windows-latest, 3.11)	52s
pytest / pytest (windows-latest, 3.12)	52s
pytest / pytest (ubuntu-20.04, 3.6)	59s
bootstrap / bootstrap (macos-latest, 3.8)	1s
bootstrap / bootstrap (macos-latest, 3.9)	1s
bootstrap / bootstrap (macos-latest, 3.10)	5s
bootstrap / bootstrap (macos-latest, 3.11)	3s
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)	56s
bootstrap / bootstrap (ubuntu-latest, 3.11)	48s
bootstrap / bootstrap (ubuntu-latest, 3.12)	1m 1s
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)	55s
	17m 59s

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