Bump serde_json from 1.0.49 to 1.0.50 (#512)
Bump serde_json from 1.0.49 to 1.0.50 (#512)

Bumps [serde_json](https://github.com/serde-rs/json) from 1.0.49 to 1.0.50.
- [Release notes](https://github.com/serde-rs/json/releases)
- [Commits](https://github.com/serde-rs/json/compare/v1.0.49...v1.0.50)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>

Co-authored-by: dependabot-preview[bot] <6a4c1c4838f800d1998274cd5234e1f65c55e90c@users.noreply.github.com>
alex/ct-tools,alex/ct-tools