Merge pull request #967 from quartiq/dependabot/cargo/serde-1.0.215 #4585

Job	Run time
style	1m 27s
compile (stable, false)	1m 12s
compile (beta, true)	1m 15s
compile (nightly, nightly, true)	1m 11s
doc	4m 14s
hitl-trigger	0s
	9m 19s

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