Bump lodash from 4.17.20 to 4.17.21

Bumps [lodash](https://github.com/lodash/lodash) from 4.17.20 to 4.17.21.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.20...4.17.21)

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

Author: dependabot[bot]

package.json

@@ -16,7 +16,7 @@
     "higlass-multivec": "0.2.8",
     "higlass-register": "^0.3.0",
     "js-cookie": "^2.2.1",
-    "lodash": "^4.17.19",
+    "lodash": "^4.17.21",
     "pubsub-js": "^1.8.0",
     "uuid": "^3.4.0",
     "vega-scale": "^6.0.0"

yarn.lock

@@ -7904,10 +7904,10 @@ lodash@^3.8.0:
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-3.10.1.tgz#5bf45e8e49ba4189e17d482789dfd15bd140b7b6"
   integrity sha1-W/Rejkm6QYnhfUgnid/RW9FAt7Y=
 
-lodash@^4.0.0, lodash@^4.0.1, lodash@^4.15.0, lodash@^4.17.10, lodash@^4.17.14, lodash@^4.17.15, lodash@^4.17.19, lodash@^4.17.4, lodash@^4.5.0, lodash@~4.17.10:
-  version "4.17.20"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.20.tgz#b44a9b6297bcb698f1c51a3545a2b3b368d59c52"
-  integrity sha512-PlhdFcillOINfeV7Ni6oF1TAEayyZBoZ8bcshTHqOYJYlrqzRK5hagpagky5o4HfCzzd1TRkXPMFq6cKk9rGmA==
+lodash@^4.0.0, lodash@^4.0.1, lodash@^4.15.0, lodash@^4.17.10, lodash@^4.17.14, lodash@^4.17.15, lodash@^4.17.19, lodash@^4.17.21, lodash@^4.17.4, lodash@^4.5.0, lodash@~4.17.10:
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
+  integrity sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==
 
 log4js@^0.6.31:
   version "0.6.38"