Bump tokio

Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.14.1 to 1.18.5.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](tokio-rs/tokio@tokio-1.14.1...tokio-1.18.5)

---
updated-dependencies:
- dependency-name: tokio
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>