Bump lodash, karma-coverage and karma-webpack in /openhtf/output/web_gui

Bumps [lodash](https://github.com/lodash/lodash) to 4.17.21 and updates ancestor dependencies [lodash](https://github.com/lodash/lodash), [karma-coverage](https://github.com/karma-runner/karma-coverage) and [karma-webpack](https://github.com/webpack-contrib/karma-webpack). These dependencies need to be updated together.


Updates `lodash` from 4.17.5 to 4.17.21
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.5...4.17.21)

Updates `karma-coverage` from 1.1.1 to 1.1.2
- [Release notes](https://github.com/karma-runner/karma-coverage/releases)
- [Changelog](https://github.com/karma-runner/karma-coverage/blob/master/CHANGELOG.md)
- [Commits](karma-runner/karma-coverage@v1.1.1...v1.1.2)

Updates `karma-webpack` from 2.0.2 to 2.0.13
- [Release notes](https://github.com/webpack-contrib/karma-webpack/releases)
- [Changelog](https://github.com/codymikol/karma-webpack/blob/master/CHANGELOG.md)
- [Commits](codymikol/karma-webpack@v2.0.2...v2.0.13)

---
updated-dependencies:
- dependency-name: lodash
  dependency-type: indirect
- dependency-name: karma-coverage
  dependency-type: direct:development
- dependency-name: karma-webpack
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

openhtf/output/web_gui/package.json

@@ -64,12 +64,12 @@
     "json-loader": "^0.5.3",
     "karma": "6.4.0",
     "karma-chrome-launcher": "^2.0.0",
-    "karma-coverage": "^1.0.0",
+    "karma-coverage": "^1.1.2",
     "karma-jasmine": "^1.0.2",
     "karma-mocha-reporter": "^2.0.3",
     "karma-remap-istanbul": "0.2.1",
     "karma-sourcemap-loader": "^0.3.7",
-    "karma-webpack": "2.0.2",
+    "karma-webpack": "2.0.13",
     "node-sass": "^7.0.3",
     "null-loader": "0.1.1",
     "postcss-loader": "^1.1.0",