fix(deps): update rust crate serde to v1.0.215 - autoclosed #188

Job	Run time
sanity-checks	42s
msrv	1m 20s
x86_64-unknown-linux-musl / stable	2m 3s
x86_64-unknown-linux-musl / nightly	1m 56s
aarch64-unknown-linux-musl / stable	2m 20s
aarch64-unknown-linux-musl / nightly	2m 18s
arm-unknown-linux-musleabi / stable	2m 29s
arm-unknown-linux-musleabi / nightly	2m 25s
i686-unknown-linux-musl / stable	1m 56s
i686-unknown-linux-musl / nightly	1m 45s
riscv64gc-unknown-linux-gnu / stable	1m 54s
riscv64gc-unknown-linux-gnu / nightly	1m 51s
aarch64-pc-windows-msvc / stable	3m 48s
aarch64-pc-windows-msvc / nightly	2m 51s
i686-pc-windows-msvc / stable	3m 27s
i686-pc-windows-msvc / nightly	2m 46s
x86_64-pc-windows-msvc / stable	3m 17s
x86_64-pc-windows-msvc / nightly	3m 41s
x86_64-apple-darwin / stable	2m 16s
x86_64-apple-darwin / nightly	1m 39s
aarch64-apple-darwin / stable	1m 18s
aarch64-apple-darwin / nightly	1m 18s
	49m 20s

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