build(deps): bump serde from 1.0.204 to 1.0.208 #793

Job	Run time
build (1.65.0, armv7a-none-eabi)	2m 31s
build (1.65.0, thumbv7em-none-eabi)	2m 31s
test (ubuntu-latest, 1.65.0)	2m 46s
build (1.65.0, wasm32-unknown-unknown)	2m 33s
test (ubuntu-latest, stable)	25s
build (stable, armv7a-none-eabi)	16s
test (macos-latest, 1.65.0)	2m 22s
build (stable, thumbv7em-none-eabi)	16s
test (macos-latest, stable)	27s
build (stable, wasm32-unknown-unknown)	17s
test (windows-latest, 1.65.0)	3m 31s
test (windows-latest, stable)	1m 36s
	19m 31s

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