Update Rust crate serde_json to v1.0.138

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
serde_json	dependencies	patch	1.0.135 -> 1.0.138

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Release Notes

serde-rs/json (serde_json)

v1.0.138

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• Documentation improvements

v1.0.137

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• Turn on "float_roundtrip" and "unbounded_depth" features for serde_json in play.rust-lang.org (#​1231)

v1.0.136

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• Optimize serde_json::value::Serializer::serialize_map by using Map::with_capacity (#​1230, thanks @​goffrie)

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