Bump webdriverio from 8.15.4 to 8.15.9 (#215)

Bumps [webdriverio](https://github.com/webdriverio/webdriverio/tree/HEAD/packages/webdriverio) from 8.15.4 to 8.15.9.
- [Release notes](https://github.com/webdriverio/webdriverio/releases)
- [Changelog](https://github.com/webdriverio/webdriverio/blob/main/CHANGELOG.md)
- [Commits](https://github.com/webdriverio/webdriverio/commits/v8.15.9/packages/webdriverio)

---
updated-dependencies:
- dependency-name: webdriverio
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>