Bump @wdio/sync from 5.7.3 to 5.7.9
Bump @wdio/sync from 5.7.3 to 5.7.9

Bumps [@wdio/sync](https://github.com/webdriverio/webdriverio) from 5.7.3 to 5.7.9.
- [Release notes](https://github.com/webdriverio/webdriverio/releases)
- [Changelog](https://github.com/webdriverio/webdriverio/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webdriverio/webdriverio/compare/v5.7.3...v5.7.9)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
percy/percy-webdriverio,percy/percy-webdriverio