Bump elliptic from 6.6.0 to 6.6.1 in /packages/credential-sdk

Bumps [elliptic](https://github.com/indutny/elliptic) from 6.6.0 to 6.6.1.
- [Commits](indutny/elliptic@v6.6.0...v6.6.1)

---
updated-dependencies:
- dependency-name: elliptic
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

packages/credential-sdk/package.json

@@ -42,7 +42,7 @@
     "blakejs": "^1.2.1",
     "bs58": "^5.0.0",
     "deep-equal": "^2.2.3",
-    "elliptic": "6.6.0",
+    "elliptic": "6.6.1",
     "js-sha256": "^0.11.0",
     "json-canonicalize": "1.0.4",
     "json-stringify-deterministic": "^1.0.12",