Bump serde from 1.0.118 to 1.0.122 (#437)

Bumps [serde](https://github.com/serde-rs/serde) from 1.0.118 to 1.0.122.
- [Release notes](https://github.com/serde-rs/serde/releases)
- [Commits](serde-rs/serde@v1.0.118...v1.0.122)

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