build(deps-dev): 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)

---
updated-dependencies:
- dependency-name: lodash
  dependency-type: direct:development
...

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

Author: dependabot[bot]

package-lock.json

@@ -178,7 +178,7 @@
     "less": "2.7.3",
     "less-loader": "4.0.5",
     "less-plugin-autoprefix": "1.5.1",
-    "lodash": "4.17.19",
+    "lodash": "4.17.21",
     "mocha": "3.2.0",
     "ngc-webpack": "1.2.0",
     "npm-run-all": "4.0.2",