Bump postcss from 8.4.29 to 8.4.31 (#8228)

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
  update-type: version-update:semver-patch
...

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

package.json

@@ -29,7 +29,7 @@
     "jquery": "^3.7.1",
     "normalize.css": "^8.0.0",
     "popper.js": "^1.16.1",
-    "postcss": "^8.4.29",
+    "postcss": "^8.4.31",
     "raven-js": "^3.7.0",
     "rollup": "^3.29.1",
     "sass": "^1.66.1",

yarn.lock

@@ -4978,7 +4978,7 @@ __metadata:
     mocha: ^10.2.0
     normalize.css: ^8.0.0
     popper.js: ^1.16.1
-    postcss: ^8.4.29
+    postcss: ^8.4.31
     prettier: ^3.0.3
     raven-js: ^3.7.0
     rollup: ^3.29.1
@@ -7316,14 +7316,14 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:^8.4.29":
-  version: 8.4.29
-  resolution: "postcss@npm:8.4.29"
+"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: dd6daa25e781db9ae5b651d9b7bfde0ec6e60e86a37da69a18eb4773d5ddd51e28fc4ff054fbdc04636a31462e6bf09a1e50986f69ac52b10d46b7457cd36d12
+  checksum: 1d8611341b073143ad90486fcdfeab49edd243377b1f51834dc4f6d028e82ce5190e4f11bb2633276864503654fb7cab28e67abdc0fbf9d1f88cad4a0ff0beea
   languageName: node
   linkType: hard