fix(deps): update rust crate serde_json to 1.0.81

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
serde_json	dependencies	patch	1.0.71 -> 1.0.81

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Release Notes

serde-rs/json

v1.0.81

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• Work around indexmap/autocfg not always properly detecting whether a std sysroot crate is available (#​885, thanks @​cuviper)

v1.0.80

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• Documentation improvements

v1.0.79

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• Allow RawValue deserialization to propagate \u escapes for unmatched surrogates, which can later by deserialized to Vec<u8> (#​830, thanks @​lucacasonato)

v1.0.78

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• Support deserializing as &RawValue in map key position, which would previously fail with "invalid type: newtype struct" (#​851)

v1.0.77

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• Include discord invite links in the published readme
• Improve compile error on compiling with neither std nor alloc feature enabled
• Include integration tests in published package (#​578)

v1.0.76

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• Fix a build error when features raw_value and alloc are enabled while std is disabled (#​850)

v1.0.75

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• Fix deserialization of small integers in arbitrary_precision mode (#​845)

v1.0.74

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• Allow creating RawValues from references to unsized values (#​841, thanks @​EFanZh)

v1.0.73

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• Update itoa dependency to 1.0

v1.0.72

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• Interpret \u-encoded lone surrogates when deserializing into a byte string (#​828, #​829, thanks @​lucacasonato)

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