build(deps): bump serde from 1.0.204 to 1.0.206 #791

Job	Run time
build (1.65.0, armv7a-none-eabi)	2m 27s
test (ubuntu-latest, 1.65.0)	2m 32s
build (1.65.0, thumbv7em-none-eabi)	2m 27s
test (ubuntu-latest, stable)	30s
build (1.65.0, wasm32-unknown-unknown)	2m 24s
test (macos-latest, 1.65.0)	2m 33s
build (stable, armv7a-none-eabi)	23s
test (macos-latest, stable)	34s
build (stable, thumbv7em-none-eabi)	23s
test (windows-latest, 1.65.0)	3m 38s
build (stable, wasm32-unknown-unknown)	26s
test (windows-latest, stable)	1m 22s
	19m 39s

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