Bump serde from 1.0.194 to 1.0.195 #304

Job	Run time
set-image	1s
spellcheck	1m 21s
fmt	2m 8s
clippy	10m 5s
check (STD)	8m 22s
check (WASM)	1m 52s
clippy-examples (STD)	10m 10s
check (RISCV)	1m 48s
dylint	4m 51s
clippy-examples (WASM)	3m 37s
test	17m 47s
build (STD)	13m 34s
build (WASM)	1m 57s
examples-test	27m 31s
docs	10m 5s
codecov	22m 48s
examples-docs	4m 5s
examples-contract-build (WASM)	16m 19s
examples-contract-build (RISCV)	3m 12s
fuzz	0s
measurements / contract-sizes	24m 13s
	3h 5m 46s

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