Bump serde from 1.0.123 to 1.0.124 (#497)

Bumps [serde](https://github.com/serde-rs/serde) from 1.0.123 to 1.0.124.
- [Release notes](https://github.com/serde-rs/serde/releases)
- [Commits](serde-rs/serde@v1.0.123...v1.0.124)

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