chore(deps): update dependency postcss to v8.4.31 [security]

Author: renovate[bot]

package.json

@@ -23,7 +23,7 @@
 		"eslint-plugin-svelte3": "3.2.1",
 		"husky": "7.0.4",
 		"netlify-cli": "8.0.3",
-		"postcss": "8.4.1",
+		"postcss": "8.4.31",
 		"postcss-load-config": "3.1.0",
 		"prettier": "2.5.0",
 		"prettier-plugin-svelte": "2.5.0",