Bump miow from 0.2.1 to 0.2.2 in /workshop_serveless/ex4

Bumps [miow](https://github.com/yoshuawuyts/miow) from 0.2.1 to 0.2.2.
- [Release notes](https://github.com/yoshuawuyts/miow/releases)
- [Changelog](https://github.com/yoshuawuyts/miow/blob/master/CHANGELOG.md)
- [Commits](yoshuawuyts/miow@0.2.1...0.2.2)

---
updated-dependencies:
- dependency-name: miow
  dependency-type: indirect
...

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