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

@@ -17,7 +17,7 @@
     "@types/node": ">=8.0.0 <15",
     "abort-controller": "^3.0.0",
     "abortcontroller-polyfill": "^1.4.0",
-    "lodash": "^4.17.19",
+    "lodash": "^4.17.21",
     "node-fetch": "^2.6.1"
   },
   "main": "./lib/airtable.js",