Bumps [elliptic](https://github.com/indutny/elliptic) from 6.5.3 to 6.5.4.
- [Release notes](https://github.com/indutny/elliptic/releases)
- [Commits](https://github.com/indutny/elliptic/compare/v6.5.3...v6.5.4

)

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

Dart-sass is the primary implementation of sass and it provides a pure js
package which is easier for developers to work with and doesn't need the
compilation step that node-sass needs for libsass