Update dependency postcss to v8.5.12 (#19093)

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

package.json

@@ -109,7 +109,7 @@
     "parse-json": "8.3.0",
     "picocolors": "1.1.1",
     "please-upgrade-node": "3.2.0",
-    "postcss": "8.5.10",
+    "postcss": "8.5.12",
     "postcss-less": "6.0.0",
     "postcss-media-query-parser": "0.2.3",
     "postcss-scss": "4.0.9",

yarn.lock

@@ -8543,14 +8543,14 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:8.5.10":
-  version: 8.5.10
-  resolution: "postcss@npm:8.5.10"
+"postcss@npm:8.5.12":
+  version: 8.5.12
+  resolution: "postcss@npm:8.5.12"
   dependencies:
     nanoid: "npm:^3.3.11"
     picocolors: "npm:^1.1.1"
     source-map-js: "npm:^1.2.1"
-  checksum: 10/7eac6169e535b63c8412e94d4f6047fc23efa3e9dde804b541940043c831b25f1cd867d83cd2c4371ad2450c8abcb42c208aa25668c1f0f3650d7f72faf711a8
+  checksum: 10/ec6b79b68c363eca3c8ffceb134a4ab637274aee6ac0857614bf7c18d40ce4ce5f9036edec57b7e0be99895724d2599d0ec7328dbd7f407204e7548697b322f1
   languageName: node
   linkType: hard
 
@@ -8692,7 +8692,7 @@ __metadata:
     parse-json: "npm:8.3.0"
     picocolors: "npm:1.1.1"
     please-upgrade-node: "npm:3.2.0"
-    postcss: "npm:8.5.10"
+    postcss: "npm:8.5.12"
     postcss-less: "npm:6.0.0"
     postcss-media-query-parser: "npm:0.2.3"
     postcss-scss: "npm:4.0.9"