Bump postcss from 8.4.29 to 8.4.31

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](postcss/postcss@8.4.29...8.4.31)

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

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -32,7 +32,7 @@
     "comlink": "^4.4.1",
     "lodash": "4.17.21",
     "normalize.css": "8.0.1",
-    "postcss": "8.4.29",
+    "postcss": "8.4.31",
     "postcss-import": "15.1.0",
     "postcss-load-config": "^4.0.1",
     "postcss-loader": "7.3.3",

yarn.lock

@@ -8324,7 +8324,18 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:8.4.29, postcss@npm:^8.4.14, postcss@npm:^8.4.27":
+"postcss@npm:8.4.31":
+  version: 8.4.31
+  resolution: "postcss@npm:8.4.31"
+  dependencies:
+    nanoid: ^3.3.6
+    picocolors: ^1.0.0
+    source-map-js: ^1.0.2
+  checksum: 1d8611341b073143ad90486fcdfeab49edd243377b1f51834dc4f6d028e82ce5190e4f11bb2633276864503654fb7cab28e67abdc0fbf9d1f88cad4a0ff0beea
+  languageName: node
+  linkType: hard
+
+"postcss@npm:^8.4.14, postcss@npm:^8.4.27":
   version: 8.4.29
   resolution: "postcss@npm:8.4.29"
   dependencies:
@@ -10281,7 +10292,7 @@ __metadata:
     eslint-plugin-svelte3: ^4.0.0
     lodash: 4.17.21
     normalize.css: 8.0.1
-    postcss: 8.4.29
+    postcss: 8.4.31
     postcss-import: 15.1.0
     postcss-load-config: ^4.0.1
     postcss-loader: 7.3.3