upgrade(deps): bump karma from 6.4.0 to 6.4.2

Bumps [karma](https://github.com/karma-runner/karma) from 6.4.0 to 6.4.2.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](karma-runner/karma@v6.4.0...v6.4.2)

---
updated-dependencies:
- dependency-name: karma
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

packages/sui-test/package.json

@@ -28,7 +28,7 @@
     "babel-plugin-istanbul": "6.0.0",
     "babel-preset-sui": "3",
     "commander": "8.3.0",
-    "karma": "6.4.0",
+    "karma": "6.4.2",
     "karma-chrome-launcher": "3.2.0",
     "karma-coverage": "2.2.0",
     "karma-firefox-launcher": "2.1.2",