Merge pull request #986 from quartiq/dependabot/cargo/serde-1.0.216 #4668

Job	Run time
doc	4m 24s
compile (stable, false)	1m 18s
style	1m 29s
compile (beta, true)	1m 21s
compile (nightly, nightly, true)	1m 29s
hitl-trigger	0s
	10m 1s

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