Bump lodash from 4.17.19 to 4.17.21 (#6722)

* Bump lodash from 4.17.19 to 4.17.21

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.19 to 4.17.21.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.19...4.17.21)

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

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

package.json

@@ -86,7 +86,7 @@
     "karma-sourcemap-loader": "^0.3.7",
     "karma-spec-reporter": "^0.0.31",
     "karma-webpack": "^3.0.5",
-    "lodash": "^4.17.4",
+    "lodash": "^4.17.21",
     "mocha": "^5.0.0",
     "morgan": "^1.10.0",
     "opn": "^5.4.0",