Add PhiSpiral256 Leaf Planetarium plan to ndarray index #488

Job	Run time
Pass MSRV values to other jobs	2s
cargo-careful	41s
format/stable	20s
clippy/1.95.0	42s
native-backend/stable	6m 38s
nostd/thumbv6m-none-eabi/stable	25s
miri	1m 11s
tier4-avx512-check	31s
nightly-simd-polyfill	1m 34s
docs/nightly	51s
hpc-stream-parallel/rayon	1m 20s
cross_test/${{ matrix.target }}/${{ matrix.rust }}	0s
tests/stable	10m 42s
blas-msrv	48s
tests/1.95.0	10m 37s
tests/beta	10m 54s
conclusion	0s
	47m 16s

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