Bump ryu from 1.0.3 to 1.0.4 (#551)
Bump ryu from 1.0.3 to 1.0.4 (#551)

Bumps [ryu](https://github.com/dtolnay/ryu) from 1.0.3 to 1.0.4.
- [Release notes](https://github.com/dtolnay/ryu/releases)
- [Commits](https://github.com/dtolnay/ryu/compare/1.0.3...1.0.4)

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