Update dependency @types/styled-system to ^5.1.20 (#674)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -60,7 +60,7 @@
     "styled-components": "^5.3.0"
   },
   "dependencies": {
-    "@types/styled-system": "^5.1.19",
+    "@types/styled-system": "^5.1.20",
     "date-fns": "^2.30.0",
     "lodash.clonedeep": "^4.5.0",
     "polished": "^4.2.2",