build(deps): bump serde from 1.0.210 to 1.0.215 #808

Job	Run time
test (ubuntu-latest, 1.60.0)	1m 48s
build (1.60.0, armv7a-none-eabi)	1m 45s
test (ubuntu-latest, stable)	23s
test (macos-latest, 1.60.0)	1m 47s
build (1.60.0, thumbv7em-none-eabi)	1m 48s
test (macos-latest, stable)	14s
build (1.60.0, wasm32-unknown-unknown)	1m 44s
test (windows-latest, 1.60.0)	2m 23s
build (stable, armv7a-none-eabi)	9s
test (windows-latest, stable)	1m 18s
build (stable, thumbv7em-none-eabi)	20s
build (stable, wasm32-unknown-unknown)	22s
	14m 1s

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