Removes `DataOwned` bound on `remove_index` #470

Job	Run time
Pass MSRV values to other jobs	4s
format/nightly	15s
nostd/thumbv6m-none-eabi/stable	22s
clippy/stable	18s
miri	8m 27s
cross_test/i686-unknown-linux-gnu/stable	1m 28s
cross_test/s390x-unknown-linux-gnu/stable	7m 11s
cargo-careful	2m 11s
docs/nightly	21s
blas-msrv	45s
tests/beta	2m 32s
tests/nightly	3m 24s
tests/stable	2m 35s
tests/1.64.0	3m 57s
conclusion	2s
	33m 52s

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