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] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -54,7 +54,7 @@
     "highcharts": "^6.2.0",
     "jquery": "^3.5.0",
     "json2csv": "^3.11.5",
-    "lodash": "^4.17.19",
+    "lodash": "^4.17.21",
     "mathjs": "^3.18.0",
     "method-override": "^2.3.10",
     "moment": "^2.23.0",