chore(deps): bump yargs-parser from 15.0.0 to 15.0.1 in /plugins/rss

Bumps [yargs-parser](https://github.com/yargs/yargs-parser) from 15.0.0 to 15.0.1.
- [Release notes](https://github.com/yargs/yargs-parser/releases)
- [Changelog](https://github.com/yargs/yargs-parser/blob/master/docs/CHANGELOG-full.md)
- [Commits](https://github.com/yargs/yargs-parser/commits)

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

Author: dependabot[bot]