Bump async-net from 1.7.0 to 2.0.0

Bumps [async-net](https://github.com/smol-rs/async-net) from 1.7.0 to 2.0.0.
- [Release notes](https://github.com/smol-rs/async-net/releases)
- [Changelog](https://github.com/smol-rs/async-net/blob/master/CHANGELOG.md)
- [Commits](smol-rs/async-net@v1.7.0...v2.0.0)

---
updated-dependencies:
- dependency-name: async-net
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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