Actually ensure the contents of `pyproject.toml` do not change after cleanup #419

Job	Run time
test-poetry-dev (3.11, git+https://github.com/python-poetry/poetry.git@main)	55s
pre-commit	30s
test-poetry-v1 (3.8, 1.2.2, false)	1m 22s
test-poetry-v2 (3.9, 2.0.0, false)	47s
test-poetry-v1 (3.8, 1.3.2, false)	1m 26s
test-poetry-v2 (3.10, 2.0.0, false)	46s
test-poetry-v1 (3.8, 1.4.2, false)	1m 13s
test-poetry-v2 (3.11, 2.0.0, false)	44s
test-poetry-v1 (3.8, 1.5.1, false)	1m 6s
test-poetry-v2 (3.12, 2.0.0, true)	52s
test-poetry-v1 (3.8, 1.6.1, false)	1m 1s
test-poetry-v2 (3.13, 2.0.0, true)	1m 5s
test-poetry-v1 (3.8, 1.7.1, false)	1m 3s
test-poetry-v1 (3.8, 1.8.4, false)	1m 6s
test-poetry-v1 (3.9, 1.2.2, false)	1m 18s
test-poetry-v1 (3.9, 1.3.2, false)	1m 11s
test-poetry-v1 (3.9, 1.4.2, false)	1m 10s
test-poetry-v1 (3.9, 1.5.1, false)	1m 1s
test-poetry-v1 (3.9, 1.6.1, false)	57s
test-poetry-v1 (3.9, 1.7.1, false)	57s
test-poetry-v1 (3.9, 1.8.4, false)	1m 5s
test-poetry-v1 (3.10, 1.2.2, false)	20s
test-poetry-v1 (3.10, 1.3.2, false)	1m 14s
test-poetry-v1 (3.10, 1.4.2, false)	1m 10s
test-poetry-v1 (3.10, 1.5.1, false)	1m 12s
test-poetry-v1 (3.10, 1.6.1, false)	1m 2s
test-poetry-v1 (3.10, 1.7.1, false)	1m 2s
test-poetry-v1 (3.10, 1.8.4, false)	57s
test-poetry-v1 (3.11, 1.2.2, false)	1m 12s
test-poetry-v1 (3.11, 1.3.2, false)	1m 17s
test-poetry-v1 (3.11, 1.4.2, false)	1m 0s
test-poetry-v1 (3.11, 1.5.1, false)	53s
test-poetry-v1 (3.11, 1.6.1, false)	54s
test-poetry-v1 (3.11, 1.7.1, false)	57s
test-poetry-v1 (3.11, 1.8.4, false)	56s
test-poetry-v1 (3.12, 1.8.4, true)	57s
test-poetry-v1 (3.13, 1.8.4, true)	1m 15s
	37m 53s

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