Bump @wdio/spec-reporter from 8.15.0 to 8.15.7

Bumps [@wdio/spec-reporter](https://github.com/webdriverio/webdriverio/tree/HEAD/packages/wdio-spec-reporter) from 8.15.0 to 8.15.7.
- [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/v8.15.7/packages/wdio-spec-reporter)

---
updated-dependencies:
- dependency-name: "@wdio/spec-reporter"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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