Bump dompurify from 2.0.14 to 2.0.15

Bumps [dompurify](https://github.com/cure53/DOMPurify) from 2.0.14 to 2.0.15.
- [Release notes](https://github.com/cure53/DOMPurify/releases)
- [Commits](https://github.com/cure53/DOMPurify/compare/2.0.14...2.0.15

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Signed-off-by: npmbuildbot[bot] <npmbuildbot[bot]@users.noreply.github.com>
Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>