Update Rust crate serde to 1.0.188

[nextest-bot]

This PR contains the following updates:

Package	Type	Update	Change
serde (source)	dependencies	patch	1.0.178 -> 1.0.188

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Release Notes

serde-rs/serde (serde)

v1.0.188

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• Fix "failed to parse manifest" error when building serde using a Cargo version between 1.45 and 1.50 (#​2603)

v1.0.187

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• Remove support for Emscripten targets on rustc older than 1.40 (#​2600)

v1.0.186

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• Disallow incompatible versions of serde_derive and serde in the dependency graph (#​2588, thanks @​soqb)

v1.0.185

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• Fix error "cannot move out of *self which is behind a shared reference" deriving Serialize on a non_exhaustive enum (#​2591)

v1.0.184

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• Restore from-source serde_derive build on all platforms — eventually we'd like to use a first-class precompiled macro if such a thing becomes supported by cargo / crates.io

v1.0.183

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• Support deserializing Box<OsStr> with an equivalent representation as OsString (#​2556, thanks @​DBLouis)

v1.0.182

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• Render field aliases in sorted order in error messages (#​2458, thanks @​Mingun)
• Support serde(default) on tuple structs (#​2553, thanks @​Mingun)

v1.0.181

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• Make serde(alias) work in combination with flatten when using in-place deserialization (#​2443, thanks @​Mingun)
• Improve the representation of adjacently tagged enums in formats where enum tags are serialized by index, as opposed to by string name (#​2505, #​2496, thanks @​Baptistemontan)

v1.0.180

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• Update to 2018 edition

v1.0.179

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• Support serialization of tuple variants inside a flattened field (#​2448, thanks @​Mingun)

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