fix(deps): bump lodash from 4.17.15 to 4.17.21

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.15 to 4.17.21.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.15...4.17.21)

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

package.json

@@ -29,7 +29,7 @@
     "express": "^4.17.1",
     "express-session": "^1.17.0",
     "jsonwebtoken": "^8.5.1",
-    "lodash": "^4.17.15",
+    "lodash": "^4.17.21",
     "mongodb": "^3.3.0",
     "mongoose": "^5.6.10",
     "mongoose-encryption": "^2.0.2",