Bump elliptic from 6.5.7 to 6.6.1 (#750)

Bumps [elliptic](https://github.com/indutny/elliptic) from 6.5.7 to 6.6.1.
- [Commits](indutny/elliptic@v6.5.7...v6.6.1)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]