Bump lodash from 4.17.15 to 4.17.19 in /src/Umbraco.Web.UI.Client

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

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

src/Umbraco.Web.UI.Client/package.json

@@ -77,7 +77,7 @@
     "karma-phantomjs-launcher": "1.0.4",
     "karma-spec-reporter": "0.0.32",
     "less": "3.10.3",
-    "lodash": "4.17.15",
+    "lodash": "4.17.19",
     "marked": "^0.7.0",
     "merge-stream": "2.0.0",
     "run-sequence": "2.2.1"