chore: update deprecated `index_last` to `last_index` (#72) #158

Job	Run time
build (ubuntu-20.04, debug)	26s
build (ubuntu-20.04, dev)	27s
build (ubuntu-20.04, release)	1m 22s
build (macos-latest, debug)	4m 41s
build (macos-latest, dev)	1m 8s
build (macos-latest, release)	1m 58s
build (windows-latest, debug)	1m 56s
build (windows-latest, dev)	2m 12s
build (windows-latest, release)	3m 22s
	17m 32s

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