Update karma requirement to ^2.0.2 in /build

Updates the requirements on [karma](https://github.com/karma-runner/karma) to permit the latest version.
- [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/commits/v2.0.2)

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

build/package.json

@@ -16,7 +16,7 @@
     "jasmine-core": "~2.5.2",
     "jasmine-sinon": "^0.4.0",
     "jsdoc": "~3.5.5",
-    "karma": "^1.5.0",
+    "karma": "^2.0.2",
     "karma-coverage": "*",
     "karma-jasmine": "^1.1.0",
     "karma-jasmine-sinon": "^1.0.4",