Update Rust crate serde_json to v1.0.120

This MR contains the following updates:

Package	Type	Update	Change
serde_json	dependencies	patch	1.0.119 -> 1.0.120

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Release Notes

serde-rs/json (serde_json)

v1.0.120

Compare Source

• Correctly specify required version of indexmap dependency (#​1152, thanks @​cforycki)

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