chore(deps-dev): bump elliptic from 6.5.4 to 6.5.7 in /packages/conce…

…rto-util (#893)

chore(deps-dev): bump elliptic in /packages/concerto-util

Bumps [elliptic](https://github.com/indutny/elliptic) from 6.5.4 to 6.5.7.
- [Commits](indutny/elliptic@v6.5.4...v6.5.7)

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

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