chore(deps-dev): bump testdouble from 3.16.7 to 3.16.8

Bumps [testdouble](https://github.com/testdouble/testdouble.js) from 3.16.7 to 3.16.8.
- [Release notes](https://github.com/testdouble/testdouble.js/releases)
- [Changelog](https://github.com/testdouble/testdouble.js/blob/main/CHANGELOG.md)
- [Commits](testdouble/testdouble.js@v3.16.7...v3.16.8)

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

Signed-off-by: dependabot[bot] <support@github.com>