Bump elliptic (#259)

Bumps  and [elliptic](https://github.com/indutny/elliptic). These dependencies needed to be updated together.

Updates `elliptic` from 6.5.5 to 6.6.0
- [Commits](indutny/elliptic@v6.5.5...v6.6.0)

Updates `elliptic` from 6.5.4 to 6.6.0
- [Commits](indutny/elliptic@v6.5.5...v6.6.0)

---
updated-dependencies:
- dependency-name: elliptic
  dependency-type: indirect
- dependency-name: elliptic
  dependency-type: indirect
...

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Author: dependabot[bot]