Bump lodash from 4.17.19 to 4.17.21 in /dashboard (#722)

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]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

dashboard/package-lock.json

@@ -7,7 +7,7 @@
     "eslint": "^6.5.0",
     "handlebars": "^4.7.7",
     "js-yaml": ">=3.13.1",
-    "lodash": "^4.17.19",
+    "lodash": "^4.17.21",
     "react": "^16.10.1",
     "react-copy-to-clipboard": "^5.0.1",
     "react-dom": "^16.10.1",