Bump elliptic from 6.5.7 to 6.6.0 in /examples/Spar/Server/ClientApp (#…

…2567)

Bumps [elliptic](https://github.com/indutny/elliptic) from 6.5.7 to 6.6.0.
- [Commits](indutny/elliptic@v6.5.7...v6.6.0)

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

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