Bump image_optim from 0.28.0 to 0.29.0
Bump image_optim from 0.28.0 to 0.29.0

Bumps [image_optim](https://github.com/toy/image_optim) from 0.28.0 to 0.29.0.
- [Release notes](https://github.com/toy/image_optim/releases)
- [Changelog](https://github.com/toy/image_optim/blob/master/CHANGELOG.markdown)
- [Commits](https://github.com/toy/image_optim/compare/v0.28.0...v0.29.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
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