Install parcels in RTD (for `main`) #613

Job	Run time
mypy	3m 31s
py3.13 \| macos \| integration tests	15m 58s
py3.13 \| macos \| unit tests	10m 19s
py3.13 \| ubuntu \| integration tests	17m 16s
py3.13 \| ubuntu \| unit tests	13m 43s
py3.13 \| windows \| integration tests	30m 57s
py3.13 \| windows \| unit tests	21m 38s
py3.10 \| ubuntu \| integration tests	29m 48s
py3.10 \| ubuntu \| unit tests	13m 37s
py3.11 \| ubuntu \| unit tests	13m 30s
py3.12 \| ubuntu \| unit tests	13m 58s
merge-test-artifacts	3s
	3h 4m 18s

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