Merge pull request #993 from quartiq/dependabot/cargo/serde-1.0.217 #4703

Job	Run time
doc	4m 29s
compile (stable, false)	1m 39s
style	1m 26s
compile (beta, true)	1m 23s
compile (nightly, nightly, true)	1m 15s
hitl-trigger	0s
	10m 12s

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