[Demo Dependencies]: Bump the dependencies-dev group

Bumps the dependencies-dev group in /docs-src with 1 update: [@testing-library/jest-dom](https://github.com/testing-library/jest-dom).


Updates `@testing-library/jest-dom` from 5.17.0 to 6.1.5
- [Release notes](https://github.com/testing-library/jest-dom/releases)
- [Changelog](https://github.com/testing-library/jest-dom/blob/main/CHANGELOG.md)
- [Commits](testing-library/jest-dom@v5.17.0...v6.1.5)

---
updated-dependencies:
- dependency-name: "@testing-library/jest-dom"
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: dependencies-dev
...

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