[Security] Bump elliptic from 6.5.0 to 6.5.3

Bumps [elliptic](https://github.com/indutny/elliptic) from 6.5.0 to 6.5.3. **This update includes a security fix.**
- [Release notes](https://github.com/indutny/elliptic/releases)
- [Commits](https://github.com/indutny/elliptic/compare/v6.5.0...v6.5.3

)

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