Bump tokio from 1.11.0 to 1.13.1 in /net_test

Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.11.0 to 1.13.1.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](tokio-rs/tokio@tokio-1.11.0...tokio-1.13.1)

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

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

Author: dependabot[bot]