Bump elliptic from 6.4.1 to 6.6.1

Bumps [elliptic](https://github.com/indutny/elliptic) from 6.4.1 to 6.6.1.
- [Commits](indutny/elliptic@v6.4.1...v6.6.1)

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

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Author: dependabot[bot]