Bump tokio from 1.3.0 to 1.4.0 (#965)
Bump tokio from 1.3.0 to 1.4.0 (#965)

Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.3.0 to 1.4.0.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](https://github.com/tokio-rs/tokio/compare/tokio-1.3.0...tokio-1.4.0)

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

Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
alex/ct-tools,alex/ct-tools