Bump elliptic from 6.5.7 to 6.6.0 in /samples/react-bot-framework

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

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

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

samples/react-bot-framework/package-lock.json

@@ -18263,9 +18263,9 @@
       "integrity": "sha512-qShjzEYpa57NnhbW2K+g+Fl+eNoDvQ7I+2MRwWnU6Z6F0HhXekzsECCLv+y2OJUsRodjqoSfwHkIX42VUFtUzg=="
     },
     "elliptic": {
-      "version": "6.5.7",
-      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.7.tgz",
-      "integrity": "sha512-ESVCtTwiA+XhY3wyh24QqRGBoP3rEdDUl3EDUUo9tft074fi19IrdpH7hLCMMP3CIj7jb3W96rn8lt/BqIlt5Q==",
+      "version": "6.6.0",
+      "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.6.0.tgz",
+      "integrity": "sha512-dpwoQcLc/2WLQvJvLRHKZ+f9FgOdjnq11rurqwekGQygGPsYSK29OMMD2WalatiqQ+XGFDglTNixpPfI+lpaAA==",
       "dev": true,
       "requires": {
         "bn.js": "^4.11.9",