Remove `indices` keyword from FieldSet and Field #686

Job	Run time
mypy	3m 32s
py3.13 \| macos \| integration tests	13m 22s
py3.13 \| macos \| unit tests	10m 13s
py3.13 \| ubuntu \| integration tests	17m 15s
py3.13 \| ubuntu \| unit tests	10m 14s
py3.13 \| windows \| integration tests	30m 49s
py3.13 \| windows \| unit tests	14m 30s
py3.10 \| ubuntu \| integration tests	17m 11s
py3.10 \| ubuntu \| unit tests	11m 15s
py3.11 \| ubuntu \| unit tests	10m 36s
py3.12 \| ubuntu \| unit tests	10m 44s
merge-test-artifacts	2s
	2h 29m 43s

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