Bump lodash from 4.17.15 to 4.17.21

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.15 to 4.17.21.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.15...4.17.21)

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

Author: dependabot[bot]

package-lock.json

@@ -21,7 +21,7 @@
     "@angular/platform-browser": "~8.2.9",
     "@angular/platform-browser-dynamic": "~8.2.9",
     "@angular/router": "~8.2.9",
-    "lodash": "^4.17.15",
+    "lodash": "^4.17.21",
     "rxjs": "~6.5.3",
     "serialize-javascript": "^2.1.2",
     "tslib": "^1.9.0",