Fix some unconditional references to tool.poetry #355

Job	Run time
pre-commit	41s
test (3.7, 1.2.2)	2m 19s
test (3.7, 1.3.2)	1m 31s
test (3.7, 1.4.2)	1m 15s
test (3.7, 1.5.1)	1m 23s
test (3.8, 1.2.2)	1m 53s
test (3.8, 1.3.2)	1m 32s
test (3.8, 1.4.2)	1m 10s
test (3.8, 1.5.1)	1m 5s
test (3.8, 1.6.1)	1m 3s
test (3.8, 1.7.1)	1m 3s
test (3.8, 1.8.1)	1m 5s
test (3.9, 1.2.2)	2m 0s
test (3.9, 1.3.2)	1m 34s
test (3.9, 1.4.2)	1m 23s
test (3.9, 1.5.1)	1m 4s
test (3.9, 1.6.1)	1m 10s
test (3.9, 1.7.1)	1m 7s
test (3.9, 1.8.1)	1m 9s
test (3.10, 1.2.2)	1m 57s
test (3.10, 1.3.2)	1m 28s
test (3.10, 1.4.2)	1m 11s
test (3.10, 1.5.1)	1m 8s
test (3.10, 1.6.1)	1m 4s
test (3.10, 1.7.1)	1m 4s
test (3.10, 1.8.1)	1m 8s
test (3.11, 1.2.2)	1m 52s
test (3.11, 1.3.2)	1m 30s
test (3.11, 1.4.2)	1m 2s
test (3.11, 1.5.1)	1m 8s
test (3.11, 1.6.1)	59s
test (3.11, 1.7.1)	1m 0s
test (3.11, 1.8.1)	1m 18s
test (3.11, git+https://github.com/radoering/poetry.git@pep621-support)	1m 1s
	44m 17s

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