Bump maildev from 1.1.0 to 2.0.5 in /tests/UI

Bumps [maildev](https://github.com/maildev/maildev) from 1.1.0 to 2.0.5.
- [Release notes](https://github.com/maildev/maildev/releases)
- [Commits](maildev/maildev@v1.1.0...v2.0.5)

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

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