Bump karma from 6.0.3 to 6.0.4

Bumps [karma](https://github.com/karma-runner/karma) from 6.0.3 to 6.0.4.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](karma-runner/karma@v6.0.3...v6.0.4)

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

Author: dependabot[bot]

package-lock.json

@@ -59,7 +59,7 @@
     "codelyzer": "^6.0.1",
     "jasmine-core": "~3.6.0",
     "jasmine-spec-reporter": "~6.0.0",
-    "karma": "^6.0.3",
+    "karma": "^6.0.4",
     "karma-chrome-launcher": "~3.1.0",
     "karma-coverage-istanbul-reporter": "~3.0.3",
     "karma-jasmine": "~4.0.1",