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)

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

package.json

@@ -65,7 +65,7 @@
     "font-awesome": "4.7.0",
     "golden-layout": "1.5.9",
     "jss": "10.1.1",
-    "lodash": "4.17.19",
+    "lodash": "4.17.21",
     "lz-string": "1.4.4",
     "markdown-it": "11.0.0",
     "markdown-it-anchor": "5.3.0",