chore(deps): update dependency postcss to v8.4.21

Author: renovate[bot]

package.json

@@ -9,7 +9,7 @@
   "devDependencies": {
     "@privyid/tailwind-preset": "0.9.0",
     "autoprefixer": "10.4.12",
-    "postcss": "8.4.18",
+    "postcss": "8.4.21",
     "tailwindcss": "3.3.0",
     "vitepress": "1.0.0-alpha.49",
     "vue": "3.2.45"

yarn.lock

@@ -3741,18 +3741,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:8.4.18":
-  version: 8.4.18
-  resolution: "postcss@npm:8.4.18"
-  dependencies:
-    nanoid: ^3.3.4
-    picocolors: ^1.0.0
-    source-map-js: ^1.0.2
-  checksum: 9349fd99849b2e3d2e134ff949b7770ecb12375f352723ce2bcc06167eba3850ea7844c1b191a85cd915d6a396b4e8ee9a5267e6cc5d8d003d0cbc7a97555d39
-  languageName: node
-  linkType: hard
-
-"postcss@npm:^8.0.9, postcss@npm:^8.3.11, postcss@npm:^8.4.21":
+"postcss@npm:8.4.21, postcss@npm:^8.0.9, postcss@npm:^8.3.11, postcss@npm:^8.4.21":
   version: 8.4.21
   resolution: "postcss@npm:8.4.21"
   dependencies:
@@ -3989,7 +3978,7 @@ __metadata:
     "@privyid/persona": 0.9.0
     "@privyid/tailwind-preset": 0.9.0
     autoprefixer: 10.4.12
-    postcss: 8.4.18
+    postcss: 8.4.21
     tailwindcss: 3.3.0
     vitepress: 1.0.0-alpha.49
     vue: 3.2.45