fix(deps): update rust crate serde to v1.0.215 - autoclosed #190

Job	Run time
sanity-checks	40s
msrv	1m 22s
x86_64-unknown-linux-musl / stable	1m 54s
x86_64-unknown-linux-musl / nightly	1m 42s
aarch64-unknown-linux-musl / stable	2m 23s
aarch64-unknown-linux-musl / nightly	2m 6s
arm-unknown-linux-musleabi / stable	2m 21s
arm-unknown-linux-musleabi / nightly	2m 12s
i686-unknown-linux-musl / stable	1m 32s
i686-unknown-linux-musl / nightly	1m 44s
riscv64gc-unknown-linux-gnu / stable	1m 48s
riscv64gc-unknown-linux-gnu / nightly	1m 56s
aarch64-pc-windows-msvc / stable	4m 2s
aarch64-pc-windows-msvc / nightly	3m 28s
i686-pc-windows-msvc / stable	3m 56s
i686-pc-windows-msvc / nightly	2m 53s
x86_64-pc-windows-msvc / stable	3m 14s
x86_64-pc-windows-msvc / nightly	3m 45s
x86_64-apple-darwin / stable	1m 58s
x86_64-apple-darwin / nightly	1m 46s
aarch64-apple-darwin / stable	1m 11s
aarch64-apple-darwin / nightly	1m 12s
	49m 5s

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