Update dependency postcss to v8.4.21

web/package.json

@@ -23,7 +23,7 @@
   },
   "devDependencies": {
     "autoprefixer": "10.4.4",
-    "postcss": "8.4.12",
+    "postcss": "8.4.21",
     "postcss-loader": "6.2.1",
     "tailwindcss": "3.0.23"
   }

yarn.lock

@@ -17540,6 +17540,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"nanoid@npm:^3.3.4":
+  version: 3.3.4
+  resolution: "nanoid@npm:3.3.4"
+  bin:
+    nanoid: bin/nanoid.cjs
+  checksum: a0747d5c6021828fe8d38334e5afb05d3268d7d4b06024058ec894ccc47070e4e81d268a6b75488d2ff3485fa79a75c251d4b7c6f31051bb54bb662b6fd2a27d
+  languageName: node
+  linkType: hard
+
 "nanomatch@npm:^1.2.9":
   version: 1.2.13
   resolution: "nanomatch@npm:1.2.13"
@@ -19331,14 +19340,14 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:8.4.12":
-  version: 8.4.12
-  resolution: "postcss@npm:8.4.12"
+"postcss@npm:8.4.21":
+  version: 8.4.21
+  resolution: "postcss@npm:8.4.21"
   dependencies:
-    nanoid: ^3.3.1
+    nanoid: ^3.3.4
     picocolors: ^1.0.0
     source-map-js: ^1.0.2
-  checksum: f5aea065c84efef236e9f387eb4fceaab3cc932c25ce480bb82f75b36a6c1a7720cc4c5ef2fb82a5d216aecb5c436af36dae45191e94a7a5b53c2b999610430f
+  checksum: a26e7cc86a1807d624d9965914c26c20faa3f237184cbd69db537387f6a4f62df97347549144284d47e9e8e27e7c60e797cb3b92ad36cb2f4c3c9cb3b73f9758
   languageName: node
   linkType: hard
 
@@ -23843,7 +23852,7 @@ __metadata:
     "@redwoodjs/router": 1.2.0
     "@redwoodjs/web": 1.2.0
     autoprefixer: 10.4.4
-    postcss: 8.4.12
+    postcss: 8.4.21
     postcss-loader: 6.2.1
     prop-types: 15.8.1
     react: 17.0.2