chore(deps): update rust crate serde_json to v1.0.120

This MR contains the following updates:

Package	Type	Update	Change
serde_json	dev-dependencies	patch	1.0.118 -> 1.0.120
serde_json	dependencies	patch	1.0.118 -> 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)

v1.0.119

Compare Source

• Add serde_json::Map::shift_insert (#​1149, thanks @​joshka)

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