Bump lodash from 4.17.15 to 4.17.19 in /webapp

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.15 to 4.17.19.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.15...4.17.19)

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

Author: dependabot[bot]

webapp/package-lock.json

@@ -25,7 +25,7 @@
     "date-fns": "^2.8.1",
     "dotenv": "^8.2.0",
     "history": "^4.10.1",
-    "lodash": "^4.17.15",
+    "lodash": "^4.17.19",
     "moment": "^2.27.0",
     "react": "^16.12.0",
     "react-autosuggest": "^9.4.3",