Bump lodash from 4.17.13 to 4.17.21

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.13 to 4.17.21.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.13...4.17.21)

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

Author: dependabot[bot]

package-lock.json

@@ -87,7 +87,7 @@
     "js-cookie": "^2.1.1",
     "less": "^2.7.1",
     "less-loader": "^4.0.2",
-    "lodash": "^4.17.13",
+    "lodash": "^4.17.21",
     "mobx": "^3.3.1",
     "mobx-react": "^4.3.3",
     "moment": "^2.14.1",