Bump smoltcp from 0.8.0 to 0.8.1 (#1097)

Bumps [smoltcp](https://github.com/smoltcp-rs/smoltcp) from 0.8.0 to 0.8.1.
- [Release notes](https://github.com/smoltcp-rs/smoltcp/releases)
- [Changelog](https://github.com/smoltcp-rs/smoltcp/blob/master/CHANGELOG.md)
- [Commits](smoltcp-rs/smoltcp@v0.8.0...v0.8.1)

---
updated-dependencies:
- dependency-name: smoltcp
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]