Bump lodash from 4.17.20 to 4.17.21

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.20 to 4.17.21.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.20...4.17.21)

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

Author: dependabot[bot]

package-lock.json

@@ -31,7 +31,7 @@
     "leaflet": "^1.7.1",
     "leaflet-heatmap": "^1.0.0",
     "leaflet-webgl-heatmap": "^0.2.7",
-    "lodash": "^4.17.20",
+    "lodash": "^4.17.21",
     "ngx-infinite-scroll": "^7.1.0",
     "ngx-skeleton-loader": "^2.9.1",
     "popper.js": "^1.16.1",