build(deps): bump serde_json from 1.0.63 to 1.0.64

Bumps [serde_json](https://github.com/serde-rs/json) from 1.0.63 to 1.0.64.
- [Release notes](https://github.com/serde-rs/json/releases)
- [Commits](serde-rs/json@v1.0.63...v1.0.64)

Signed-off-by: dependabot[bot] <support@github.com>