[Snyk] Security upgrade postcss from 8.4.27 to 8.4.31 (#1520)

* fix: packages/css/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-POSTCSS-5926692

* Update yarn.lock

---------

Co-authored-by: snyk-bot <[email protected]>
Co-authored-by: Grant Wong <[email protected]>

Author: 3 people

packages/css/package.json

@@ -26,7 +26,7 @@
     "@compiled/utils": "^0.8.0",
     "autoprefixer": "^10.4.14",
     "cssnano-preset-default": "^5.2.14",
-    "postcss": "^8.4.27",
+    "postcss": "^8.4.31",
     "postcss-discard-duplicates": "^6.0.0",
     "postcss-nested": "^5.0.6",
     "postcss-normalize-whitespace": "^5.1.1",

yarn.lock

@@ -14713,10 +14713,10 @@ postcss@^7.0.0, postcss@^7.0.1, postcss@^7.0.14, postcss@^7.0.26, postcss@^7.0.2
     picocolors "^0.2.1"
     source-map "^0.6.1"
 
-postcss@^8, postcss@^8.2.15, postcss@^8.2.4, postcss@^8.4.19, postcss@^8.4.21, postcss@^8.4.27:
-  version "8.4.27"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.27.tgz#234d7e4b72e34ba5a92c29636734349e0d9c3057"
-  integrity sha512-gY/ACJtJPSmUFPDCHtX78+01fHa64FaU4zaaWfuh1MhGJISufJAH4cun6k/8fwsHYeK4UQmENQK+tRLCFJE8JQ==
+postcss@^8, postcss@^8.2.15, postcss@^8.2.4, postcss@^8.4.19, postcss@^8.4.21, postcss@^8.4.27, postcss@^8.4.31:
+  version "8.4.31"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.31.tgz#92b451050a9f914da6755af352bdc0192508656d"
+  integrity sha512-PS08Iboia9mts/2ygV3eLpY5ghnUcfLV/EXTOW1E2qYxJKGGBUtNjN76FYHnMs36RmARn41bC0AZmn+rR0OVpQ==
   dependencies:
     nanoid "^3.3.6"
     picocolors "^1.0.0"