Update Rust crate serde to v1.0.212

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
serde (source)	dependencies	patch	1.0.211 -> 1.0.212

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Release Notes

serde-rs/serde (serde)

v1.0.212

Compare Source

• Fix hygiene of macro-generated local variable accesses in serde(with) wrappers (#​2845)

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[yegor256]

@rultor please, try to merge, since 12 checks have passed

[rultor]

@rultor please, try to merge, since 12 checks have passed

@yegor256 OK, I'll try to merge now. You can check the progress of the merge here.

[rultor]

@rultor please, try to merge, since 12 checks have passed

@yegor256 Done! FYI, the full log is here (took me 7min).