Bump zendframework/zend-feed from 2.8.0 to 2.9.0
Bump zendframework/zend-feed from 2.8.0 to 2.9.0

Bumps [zendframework/zend-feed](https://github.com/zendframework/zend-feed) from 2.8.0 to 2.9.0.
- [Release notes](https://github.com/zendframework/zend-feed/releases/tag/release-2.9.0)
- [Changelog](https://github.com/zendframework/zend-feed/blob/master/CHANGELOG.md)
- [Commits](https://github.com/zendframework/zend-feed/compare/release-2.8.0...release-2.9.0)
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