Update dependency styled-system to v3.1.4

Author: renovate-bot

package.json

@@ -86,7 +86,7 @@
     "react-event-timeline": "1.5.4",
     "react-headroom": "2.2.2",
     "react-icons": "2.2.7",
-    "styled-system": "3.1.3"
+    "styled-system": "3.1.4"
   },
   "devDependencies": {
     "all-contributors-cli": "5.4.0",

yarn.lock

@@ -7615,9 +7615,9 @@ [email protected]:
     stylis "3.4.10"
     stylis-rule-sheet "0.0.8"
 
-[email protected].3:
-  version "3.1.3"
-  resolved "https://registry.yarnpkg.com/styled-system/-/styled-system-3.1.3.tgz#a569b241e3a90978214da14bf45335cb56d94119"
+[email protected].4:
+  version "3.1.4"
+  resolved "https://registry.yarnpkg.com/styled-system/-/styled-system-3.1.4.tgz#d3cc0cfea91273c39f06af5eaaaa2decf84506c0"
   dependencies:
     prop-types "^15.6.2"