fix(deps): update rust crate serde to v1.0.203 #110

Job	Run time
sanity-checks	31s
msrv	46s
x86_64-unknown-linux-musl / stable	1m 53s
x86_64-unknown-linux-musl / nightly	1m 52s
aarch64-unknown-linux-musl / stable	2m 16s
aarch64-unknown-linux-musl / nightly	2m 27s
arm-unknown-linux-musleabi / stable	2m 16s
arm-unknown-linux-musleabi / nightly	2m 12s
i686-unknown-linux-musl / stable	1m 45s
i686-unknown-linux-musl / nightly	1m 46s
riscv64gc-unknown-linux-gnu / stable	1m 51s
riscv64gc-unknown-linux-gnu / nightly	1m 52s
aarch64-pc-windows-msvc / stable	1m 43s
aarch64-pc-windows-msvc / nightly	2m 36s
i686-pc-windows-msvc / stable	2m 49s
i686-pc-windows-msvc / nightly	2m 25s
x86_64-pc-windows-msvc / stable	3m 32s
x86_64-pc-windows-msvc / nightly	3m 49s
x86_64-apple-darwin / stable	1m 58s
x86_64-apple-darwin / nightly	2m 7s
aarch64-apple-darwin / stable	1m 27s
aarch64-apple-darwin / nightly	1m 33s
	45m 26s

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