Merge pull request #938 from quartiq/dependabot/cargo/serde-1.0.208 #4406

Job	Run time
doc	4m 6s
compile (stable, false)	1m 15s
compile (beta, true)	1m 22s
hitl-trigger	0s
compile (nightly, nightly, true)	1m 16s
style	1m 39s
	9m 38s

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