chore(deps): bump actix from 0.7.9 to 0.8.1

Bumps [actix](https://github.com/actix/actix) from 0.7.9 to 0.8.1.
- [Release notes](https://github.com/actix/actix/releases)
- [Changelog](https://github.com/actix/actix/blob/master/CHANGES.md)
- [Commits](actix/actix@0.7.9...v0.8.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>