[Security] Bump elliptic from 6.4.1 to 6.5.4

Bumps [elliptic](https://github.com/indutny/elliptic) from 6.4.1 to 6.5.4. **This update includes a security fix.**
- [Release notes](https://github.com/indutny/elliptic/releases)
- [Commits](indutny/elliptic@v6.4.1...v6.5.4)

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