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

@@ -45,6 +45,6 @@
     "jit-grunt": "0.10.0",
     "js-yaml": "3.13.1",
     "load-grunt-tasks": "5.1.0",
-    "lodash": "4.17.15"
+    "lodash": "4.17.21"
   }
 }

yarn.lock

@@ -883,10 +883,10 @@ locate-path@^3.0.0:
     p-locate "^3.0.0"
     path-exists "^3.0.0"
 
-lodash@4.17.15, lodash@^4.17.10, lodash@^4.17.11, lodash@^4.17.14, lodash@^4.8.0, lodash@~4.17.10, lodash@~4.17.11, lodash@~4.17.5:
-  version "4.17.15"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.15.tgz#b447f6670a0455bbfeedd11392eff330ea097548"
-  integrity sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==
+lodash@4.17.21, lodash@^4.17.10, lodash@^4.17.11, lodash@^4.17.14, lodash@^4.8.0, lodash@~4.17.10, lodash@~4.17.11, lodash@~4.17.5:
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
+  integrity sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==
 
 lolex@^4.0.1, lolex@^4.1.0:
   version "4.1.0"