Bump karma from 6.3.6 to 6.3.8 (#7366)

Bumps [karma](https://github.com/karma-runner/karma) from 6.3.6 to 6.3.8.
- [Release notes](https://github.com/karma-runner/karma/releases)
- [Changelog](https://github.com/karma-runner/karma/blob/master/CHANGELOG.md)
- [Commits](https://github.com/karma-runner/karma/compare/v6.3.6...v6.3.8)

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

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

package.json

@@ -146,7 +146,7 @@
     "jasmine-reporters": "^2.4.0",
     "jasmine-spec-reporter": "~7.0.0",
     "js-yaml": "^4.0.0",
-    "karma": "^6.3.6",
+    "karma": "^6.3.8",
     "karma-chrome-launcher": "~3.1.0",
     "karma-coverage-istanbul-reporter": "3.0.3",
     "karma-jasmine": "~1.1.0",