Bump serde from 1.0.214 to 1.0.215 #1646

Job	Run time
maybe-expedite	3s
test (ubuntu-latest, without-token)	8m 45s
test (ubuntu-latest, with-token-0)	12m 11s
test (ubuntu-latest, with-token-1)	13m 47s
test (macos-latest, without-token)	9m 11s
test (macos-latest, with-token-0)	14m 7s
test (macos-latest, with-token-1)	18m 51s
test (windows-latest, without-token)	15m 39s
test (windows-latest, with-token-0)	17m 15s
test (windows-latest, with-token-1)	13m 55s
all-checks	1s
	2h 3m 45s

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