Bump karma-firefox-launcher in /modules/admin-ui-frontend

Bumps [karma-firefox-launcher](https://github.com/karma-runner/karma-firefox-launcher) from 2.1.1 to 2.1.2.
- [Release notes](https://github.com/karma-runner/karma-firefox-launcher/releases)
- [Changelog](https://github.com/karma-runner/karma-firefox-launcher/blob/master/CHANGELOG.md)
- [Commits](karma-runner/karma-firefox-launcher@v2.1.1...v2.1.2)

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

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

modules/admin-ui-frontend/package.json

@@ -41,7 +41,7 @@
     "karma-chrome-launcher": "^3.1.0",
     "karma-coverage": "^2.0.3",
     "karma-detect-browsers": "^2.0",
-    "karma-firefox-launcher": "^2.1.1",
+    "karma-firefox-launcher": "^2.1.2",
     "karma-jasmine": "^4.0.1",
     "karma-ng-html2js-preprocessor": "^1.0.0",
     "request": "^2.88.2",