build: update karma-phantomjs-launcher requirement to 1.0.4

Updates the requirements on [karma-phantomjs-launcher](https://github.com/karma-runner/karma-phantomjs-launcher) to permit the latest version.
- [Release notes](https://github.com/karma-runner/karma-phantomjs-launcher/releases)
- [Changelog](https://github.com/karma-runner/karma-phantomjs-launcher/blob/master/CHANGELOG.md)
- [Commits](https://github.com/karma-runner/karma-phantomjs-launcher/commits/v1.0.4)

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

package.json

@@ -93,7 +93,7 @@
     "karma-jasmine": "1.0.2",
     "karma-jasmine-html-reporter": "0.2.2",
     "karma-mocha-reporter": "2.2.5",
-    "karma-phantomjs-launcher": "1.0.2",
+    "karma-phantomjs-launcher": "1.0.4",
     "karma-sourcemap-loader": "0.3.7",
     "karma-webpack": "3.0.0",
     "marked": "0.3.19",