build(deps): bump elliptic from 6.5.4 to 6.5.7 in /store

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] <support@github.com>

store/yarn.lock

@@ -1540,9 +1540,9 @@ ecc-jsbn@~0.1.1:
     safer-buffer "^2.1.0"
 
 elliptic@^6.5.3, elliptic@^6.5.4:
-  version "6.5.4"
-  resolved "https://registry.yarnpkg.com/elliptic/-/elliptic-6.5.4.tgz#da37cebd31e79a1367e941b592ed1fbebd58abbb"
-  integrity sha512-iLhC6ULemrljPZb+QutR5TQGB+pdW6KGD5RSegS+8sorOZT+rdQFbsQFJgvN3eRqNALqJer4oQ16YvJHlU8hzQ==
+  version "6.5.7"
+  resolved "https://registry.yarnpkg.com/elliptic/-/elliptic-6.5.7.tgz#8ec4da2cb2939926a1b9a73619d768207e647c8b"
+  integrity sha512-ESVCtTwiA+XhY3wyh24QqRGBoP3rEdDUl3EDUUo9tft074fi19IrdpH7hLCMMP3CIj7jb3W96rn8lt/BqIlt5Q==
   dependencies:
     bn.js "^4.11.9"
     brorand "^1.1.0"