Bump mio from 0.8.8 to 0.8.11 in /examples/signaling-server-rust
Bumps [mio](https://github.com/tokio-rs/mio) from 0.8.8 to 0.8.11.
- [Release notes](https://github.com/tokio-rs/mio/releases)
- [Changelog](https://github.com/tokio-rs/mio/blob/master/CHANGELOG.md)
- [Commits](https://github.com/tokio-rs/mio/compare/v0.8.8...v0.8.11)
---
updated-dependencies:
- dependency-name: mio
dependency-type: indirect
...
Signed-off-by: dependabot[bot] <[email protected]>
dependabot[bot]