Bump drupal/core-composer-scaffold from 9.3.6 to 9.3.9

Bumps [drupal/core-composer-scaffold](https://github.com/drupal/core-composer-scaffold) from 9.3.6 to 9.3.9.
- [Release notes](https://github.com/drupal/core-composer-scaffold/releases)
- [Commits](drupal/core-composer-scaffold@9.3.6...9.3.9)

---
updated-dependencies:
- dependency-name: drupal/core-composer-scaffold
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]