Bump elliptic from 6.5.4 to 6.6.0 in /example (#540)

Bumps [elliptic](https://github.com/indutny/elliptic) from 6.5.4 to 6.6.0.
- [Commits](indutny/elliptic@v6.5.4...v6.6.0)

---
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>

Author: dependabot[bot]

example/yarn.lock

@@ -1249,9 +1249,9 @@ [email protected]:
   integrity sha512-WMwm9LhRUo+WUaRN+vRuETqG89IgZphVSNkdFgeb6sS/E4OrDIN7t48CAewSHXc6C8lefD8KKfr5vY61brQlow==
 
 elliptic@^6.5.3:
-  version "6.5.4"
-  resolved "https://registry.yarnpkg.com/elliptic/-/elliptic-6.5.4.tgz#da37cebd31e79a1367e941b592ed1fbebd58abbb"
-  integrity sha512-iLhC6ULemrljPZb+QutR5TQGB+pdW6KGD5RSegS+8sorOZT+rdQFbsQFJgvN3eRqNALqJer4oQ16YvJHlU8hzQ==
+  version "6.6.0"
+  resolved "https://registry.yarnpkg.com/elliptic/-/elliptic-6.6.0.tgz#5919ec723286c1edf28685aa89261d4761afa210"
+  integrity sha512-dpwoQcLc/2WLQvJvLRHKZ+f9FgOdjnq11rurqwekGQygGPsYSK29OMMD2WalatiqQ+XGFDglTNixpPfI+lpaAA==
   dependencies:
     bn.js "^4.11.9"
     brorand "^1.1.0"