Remove references to `poetry shell` #743

Job	Run time
poetry-check	10s
quality (lint, lint)	16s
test (3.9)	28s
quality (type_check, type_check,main,test)	22s
test (3.10)	23s
quality (docs, docs)	19s
test (3.11)	22s
test (3.12)	25s
test (3.13)	26s
	3m 11s

Provide feedback