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)

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

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

Author: dependabot[bot]

package-lock.json

@@ -49,7 +49,7 @@
     "jquery": "^3.4.1",
     "jstimezonedetect": "^1.0.6",
     "jwt-decode": "^2.2.0",
-    "lodash": "^4.17.11",
+    "lodash": "^4.17.21",
     "marked": "^1.0.0",
     "mini-css-extract-plugin": "0.4.3",
     "moment": "^2.24.0",