Bump lodash in /samples/react-appinsights-dashboard

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

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

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

samples/react-appinsights-dashboard/package-lock.json

@@ -11342,9 +11342,9 @@
       }
     },
     "lodash": {
-      "version": "4.17.15",
+      "version": "4.17.21",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.21.tgz",
-      "integrity": "sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A=="
+      "integrity": "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="
     },
     "lodash._basecopy": {
       "version": "3.0.1",

samples/react-appinsights-dashboard/package.json

@@ -22,7 +22,7 @@
     "@types/react": "16.8.8",
     "@types/react-dom": "16.8.3",
     "@types/webpack-env": "1.13.1",
-    "lodash": "^4.17.15",
+    "lodash": "^4.17.21",
     "moment": "^2.25.3",
     "office-ui-fabric-react": "6.189.2",
     "react": "16.8.5",