Use `zmij` instead of `dtoa-short` #429

Job	Run time
Linux (nightly)	28s
Linux (nightly, --no-default-features)	24s
Linux (beta)	28s
Linux (1.71.0, --features malloc_size_of)	30s
Linux (nightly, --features malloc_size_of)	29s
Linux (1.71.0)	29s
Linux (beta, --no-default-features)	28s
Linux (stable)	29s
Linux (stable, --features malloc_size_of)	25s
Linux (nightly, --features bench)	30s
Linux (1.71.0, --no-default-features)	26s
Linux (stable, --no-default-features)	25s
Linux (beta, --features malloc_size_of)	28s
Result	0s
	5m 59s

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