Bump webdriverio from 6.8.0 to 6.9.1 (#278)

Bumps [webdriverio](https://github.com/webdriverio/webdriverio) from 6.8.0 to 6.9.1.
- [Release notes](https://github.com/webdriverio/webdriverio/releases)
- [Changelog](https://github.com/webdriverio/webdriverio/blob/master/CHANGELOG.md)
- [Commits](webdriverio/webdriverio@v6.8.0...v6.9.1)

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