Update feedparser requirement from 0.16.6 to 2.2.9
Update feedparser requirement from 0.16.6 to 2.2.9

Updates the requirements on [feedparser](https://github.com/danmactough/node-feedparser) to permit the latest version.
- [Release notes](https://github.com/danmactough/node-feedparser/releases)
- [Changelog](https://github.com/danmactough/node-feedparser/blob/master/History.md)
- [Commits](https://github.com/danmactough/node-feedparser/commits/v2.2.9)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
hexojs/hexo-migrator-rss