Update postcss. (#14444)

Author: sean-mcmanus

Extension/package.json

@@ -6888,7 +6888,7 @@
         "which": "^2.0.2"
     },
     "resolutions": {
-        "postcss": "^8.4.31",
+        "postcss": "^8.5.14",
         "gulp-typescript/**/glob-parent": "^5.1.2",
         "serialize-javascript": "^7.0.5",
         "@azure/msal-browser": "^4.29.1",

Extension/yarn.lock

@@ -5029,10 +5029,10 @@ possible-typed-array-names@^1.0.0:
   resolved "https://pkgs.dev.azure.com/azure-public/VisualCpp/_packaging/cpp_PublicPackages/npm/registry/possible-typed-array-names/-/possible-typed-array-names-1.1.0.tgz#93e3582bc0e5426586d9d07b79ee40fc841de4ae"
   integrity sha1-k+NYK8DlQmWG2dB7ee5A/IQd5K4=
 
-postcss@^7.0.16, postcss@^8.4.31:
-  version "8.5.6"
-  resolved "https://pkgs.dev.azure.com/azure-public/VisualCpp/_packaging/cpp_PublicPackages/npm/registry/postcss/-/postcss-8.5.6.tgz#2825006615a619b4f62a9e7426cc120b349a8f3c"
-  integrity sha1-KCUAZhWmGbT2Kp50JswSCzSajzw=
+postcss@^7.0.16, postcss@^8.5.14:
+  version "8.5.14"
+  resolved "https://pkgs.dev.azure.com/azure-public/VisualCpp/_packaging/cpp_PublicPackages/npm/registry/postcss/-/postcss-8.5.14.tgz#a66c2d7808fadf69ebb5b84a03f8bafd76c4919c"
+  integrity sha1-pmwteAj632nrtbhKA/i6/XbEkZw=
   dependencies:
     nanoid "^3.3.11"
     picocolors "^1.1.1"