Bump postcss from 8.4.29 to 8.4.31 in /web (#528)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.29 to 8.4.31.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.4.29...8.4.31)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

web/package-lock.json

@@ -17,7 +17,7 @@
         "formik": "^2.2.9",
         "js-cookie": "^3.0.5",
         "next": "^13.4.9",
-        "postcss": "^8.4.23",
+        "postcss": "^8.4.31",
         "react": "^18.2.0",
         "react-dom": "^18.2.0",
         "react-dropzone": "^14.2.3",
@@ -4739,9 +4739,9 @@
       }
     },
     "node_modules/postcss": {
-      "version": "8.4.29",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.29.tgz",
-      "integrity": "sha512-cbI+jaqIeu/VGqXEarWkRCCffhjgXc0qjBtXpqJhTBohMUjUQnbBr0xqX3vEKudc4iviTewcJo5ajcec5+wdJw==",
+      "version": "8.4.31",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.4.31.tgz",
+      "integrity": "sha512-PS08Iboia9mts/2ygV3eLpY5ghnUcfLV/EXTOW1E2qYxJKGGBUtNjN76FYHnMs36RmARn41bC0AZmn+rR0OVpQ==",
       "funding": [
         {
           "type": "opencollective",

web/package.json

@@ -18,7 +18,7 @@
     "formik": "^2.2.9",
     "js-cookie": "^3.0.5",
     "next": "^13.4.9",
-    "postcss": "^8.4.23",
+    "postcss": "^8.4.31",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
     "react-dropzone": "^14.2.3",