Update serde

This MR contains the following updates:

Package	Type	Update	Change
serde (source)	dependencies	patch	1.0.137 -> 1.0.138
serde_derive (source)	dependencies	patch	1.0.137 -> 1.0.138
serde_json	dependencies	patch	1.0.81 -> 1.0.82

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Release Notes

serde-rs/serde

v1.0.138

Compare Source

• Documentation improvements

serde-rs/json

v1.0.82

Compare Source

• Implement From<Option<T>> for serde_json::Value where T: Into<Value> (#​900, thanks @​kvnvelasco)

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