Update dependency styled-system to v3.1.2

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": "3.1.1"
+    "styled-system": "3.1.2"
   },
   "devDependencies": {
     "all-contributors-cli": "5.4.0",

yarn.lock

@@ -7624,9 +7624,9 @@ [email protected]:
     stylis "3.4.10"
     stylis-rule-sheet "0.0.8"
 
-[email protected].1:
-  version "3.1.1"
-  resolved "https://registry.yarnpkg.com/styled-system/-/styled-system-3.1.1.tgz#9308f9709de5d4f7d210bdc260f2c73a0dfed269"
+[email protected].2:
+  version "3.1.2"
+  resolved "https://registry.yarnpkg.com/styled-system/-/styled-system-3.1.2.tgz#9797ef6e7a535708b77bdb41c1a80e678719b350"
   dependencies:
     prop-types "^15.6.2"