Bump itertools from 0.12.0 to 0.12.1 (#1117) #2859

Job	Run time
Clippy	1m 2s
Deny (advisories)	23s
Cross (aarch64-linux-android)	3m 2s
Deny (bans licenses sources)	27s
Cross (aarch64-unknown-linux-gnu)	3m 9s
Check (stable)	56s
Cross (aarch64-unknown-linux-musl)	4m 18s
Documentation	1m 24s
Check (1.70.0)	1m 14s
Format	6s
Lint markdown files	1m 6s
Tests	4m 25s
Hack	1m 46s
Tools	2m 24s
	25m 42s

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