Update dependency postcss to v8.5.19 (#11831)

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

Author: renovate[bot]

package.json

@@ -123,7 +123,7 @@
     "path-complete-extname": "1.0.0",
     "payment": "2.4.7",
     "porter-stemmer": "0.9.1",
-    "postcss": "8.5.16",
+    "postcss": "8.5.19",
     "postcss-import": "16.1.1",
     "prop-types": "15.8.1",
     "punycode": "2.3.1",

yarn.lock

@@ -18887,14 +18887,14 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:8.5.16, postcss@npm:^8.4.21, postcss@npm:^8.4.24, postcss@npm:^8.4.27, postcss@npm:^8.4.33, postcss@npm:^8.5.16, postcss@npm:^8.5.4":
-  version: 8.5.16
-  resolution: "postcss@npm:8.5.16"
+"postcss@npm:8.5.19, postcss@npm:^8.4.21, postcss@npm:^8.4.24, postcss@npm:^8.4.27, postcss@npm:^8.4.33, postcss@npm:^8.5.16, postcss@npm:^8.5.4":
+  version: 8.5.19
+  resolution: "postcss@npm:8.5.19"
   dependencies:
     nanoid: "npm:^3.3.12"
     picocolors: "npm:^1.1.1"
     source-map-js: "npm:^1.2.1"
-  checksum: 10c0/625de7a02f662f3a340964d14b487bd5097adf16f5f171e257d19005ba37aea8768ee446557500e88e91ca46b4d14d6cb4a0bf033c6ec0c8c0b660d85719f1ef
+  checksum: 10c0/302af9e4dfa8cce4f43af1798576b3a77ab7b23abac5522328c6c7a830d49b31281cba9d6071e478e6970a05ef82346d1570b8fbffae912f26a4f1a1a07f0a44
   languageName: node
   linkType: hard
 
@@ -20517,7 +20517,7 @@ __metadata:
     path-complete-extname: "npm:1.0.0"
     payment: "npm:2.4.7"
     porter-stemmer: "npm:0.9.1"
-    postcss: "npm:8.5.16"
+    postcss: "npm:8.5.19"
     postcss-import: "npm:16.1.1"
     prettier: "npm:3.9.4"
     prop-types: "npm:15.8.1"