build(deps-dev): Bump @wdio/local-runner from 9.20.1 to 9.21.0

Bumps [@wdio/local-runner](https://github.com/webdriverio/webdriverio/tree/HEAD/packages/wdio-local-runner) from 9.20.1 to 9.21.0.
- [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/v9.21.0/packages/wdio-local-runner)

---
updated-dependencies:
- dependency-name: "@wdio/local-runner"
  dependency-version: 9.21.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]