chore(deps): 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>

Author: dependabot[bot]

package-lock.json

@@ -686,7 +686,7 @@
     "dependencies": {
         "fs-extra": "^6.0.1",
         "highlight.js": "^9.15.6",
-        "lodash": "^4.17.19",
+        "lodash": "^4.17.21",
         "markdown-it": "^8.4.2",
         "require-from-string": "^2.0.2",
         "unescape-js": "^1.1.1",