Update dependency postcss to v8.5.8 (#18921)

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

yarn.lock

@@ -8335,14 +8335,14 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:8.5.6":
-  version: 8.5.6
-  resolution: "postcss@npm:8.5.6"
+"postcss@npm:8.5.8":
+  version: 8.5.8
+  resolution: "postcss@npm:8.5.8"
   dependencies:
     nanoid: "npm:^3.3.11"
     picocolors: "npm:^1.1.1"
     source-map-js: "npm:^1.2.1"
-  checksum: 10/9e4fbe97574091e9736d0e82a591e29aa100a0bf60276a926308f8c57249698935f35c5d2f4e80de778d0cbb8dcffab4f383d85fd50c5649aca421c3df729b86
+  checksum: 10/cbacbfd7f767e2c820d4bf09a3a744834dd7d14f69ff08d1f57b1a7defce9ae5efcf31981890d9697a972a64e9965de677932ef28e4c8ba23a87aad45b82c459
   languageName: node
   linkType: hard
 
@@ -8484,7 +8484,7 @@ __metadata:
     parse-json: "npm:8.3.0"
     picocolors: "npm:1.1.1"
     please-upgrade-node: "npm:3.2.0"
-    postcss: "npm:8.5.6"
+    postcss: "npm:8.5.8"
     postcss-less: "npm:6.0.0"
     postcss-media-query-parser: "npm:0.2.3"
     postcss-scss: "npm:4.0.9"