Bump elliptic from 6.5.6 to 6.5.7 in /tests_zemu (#167)

Bumps [elliptic](https://github.com/indutny/elliptic) from 6.5.6 to 6.5.7.
- [Commits](indutny/elliptic@v6.5.6...v6.5.7)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

tests_zemu/yarn.lock

@@ -2306,23 +2306,10 @@ elfy@^1.0.0:
   dependencies:
     endian-reader "^0.3.0"
 
-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==
-  dependencies:
-    bn.js "^4.11.9"
-    brorand "^1.1.0"
-    hash.js "^1.0.0"
-    hmac-drbg "^1.0.1"
-    inherits "^2.0.4"
-    minimalistic-assert "^1.0.1"
-    minimalistic-crypto-utils "^1.0.1"
-
-elliptic@^6.5.6:
-  version "6.5.6"
-  resolved "https://registry.yarnpkg.com/elliptic/-/elliptic-6.5.6.tgz#ee5f7c3a00b98a2144ac84d67d01f04d438fa53e"
-  integrity sha512-mpzdtpeCLuS3BmE3pO3Cpp5bbjlOPY2Q0PgoF+Od1XZrHLYI28Xe3ossCmYCQt11FQKEYd9+PF8jymTvtWJSHQ==
+elliptic@^6.5.4, elliptic@^6.5.6:
+  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"