Add alpha releases of Parcels to prefix.dev #1398

Job	Run time
py3.12 \| ubuntu \| unit tests	2m 50s
py3.11 \| ubuntu \| unit tests	2m 46s
mypy	0s
py${{ matrix.python-version }} \| ${{ matrix.os }} \| integration tests	0s
merge-test-artifacts	1s
	5m 37s

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