Bump icy_sixel from 0.1.3 to 0.5.0

Bumps [icy_sixel](https://github.com/mkrueger/icy_sixel) from 0.1.3 to 0.5.0.
- [Changelog](https://github.com/mkrueger/icy_sixel/blob/main/CHANGELOG.md)
- [Commits](https://github.com/mkrueger/icy_sixel/commits)

---
updated-dependencies:
- dependency-name: icy_sixel
  dependency-version: 0.5.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]