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)

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

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

Author: dependabot[bot]

package-lock.json

@@ -14,7 +14,7 @@
     "core-js": "^3.3.2",
     "element-ui": "^2.15.0",
     "firebase": "^7.16.1",
-    "lodash": "^4.17.19",
+    "lodash": "^4.17.21",
     "register-service-worker": "^1.6.2",
     "roboto-fontface": "*",
     "velocity-animate": "^1.5.2",