Update dependency postcss to v8.5.6 (#10751)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

package.json

@@ -37,7 +37,7 @@
     "globals": "16.2.0",
     "handlebars-loader": "1.7.3",
     "mini-css-extract-plugin": "2.9.2",
-    "postcss": "8.5.5",
+    "postcss": "8.5.6",
     "postcss-loader": "8.1.1",
     "postcss-preset-env": "10.2.3",
     "postcss-scss": "4.0.9",

yarn.lock

@@ -4373,7 +4373,7 @@ __metadata:
     jquery: "npm:3.7.1"
     lodash: "npm:4.17.21"
     mini-css-extract-plugin: "npm:2.9.2"
-    postcss: "npm:8.5.5"
+    postcss: "npm:8.5.6"
     postcss-loader: "npm:8.1.1"
     postcss-preset-env: "npm:10.2.3"
     postcss-scss: "npm:4.0.9"
@@ -6061,14 +6061,14 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:8.5.5, postcss@npm:^8.4.33, postcss@npm:^8.4.40, postcss@npm:^8.5.3":
-  version: 8.5.5
-  resolution: "postcss@npm:8.5.5"
+"postcss@npm:8.5.6, postcss@npm:^8.4.33, postcss@npm:^8.4.40, postcss@npm:^8.5.3":
+  version: 8.5.6
+  resolution: "postcss@npm:8.5.6"
   dependencies:
     nanoid: "npm:^3.3.11"
     picocolors: "npm:^1.1.1"
     source-map-js: "npm:^1.2.1"
-  checksum: 10c0/6415873fab84de05c2d8fd18f72ea6654bca437bb4b9f02ca819c438501e4b3a450023e575e17587c6eaa5bedddaaa4dad3af210f5cf166e30cec09cac58baf8
+  checksum: 10c0/5127cc7c91ed7a133a1b7318012d8bfa112da9ef092dddf369ae699a1f10ebbd89b1b9f25f3228795b84585c72aabd5ced5fc11f2ba467eedf7b081a66fad024
   languageName: node
   linkType: hard