Build(deps-dev): bump postcss from 8.5.5 to 8.5.6

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.5 to 8.5.6.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.5...8.5.6)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.6
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -33,7 +33,7 @@
   "devDependencies": {
     "jasmine-browser-runner": "^3.0.0",
     "jasmine-core": "^5.8.0",
-    "postcss": "^8.5.5",
+    "postcss": "^8.5.6",
     "standardx": "^7.0.0",
     "stylelint": "^16.20.0",
     "stylelint-config-gds": "^2.0.0"

yarn.lock

@@ -2973,14 +2973,14 @@ __metadata:
   languageName: node
   linkType: hard
 
-"postcss@npm:^8.5.5":
-  version: 8.5.5
-  resolution: "postcss@npm:8.5.5"
+"postcss@npm:^8.5.6":
+  version: 8.5.6
+  resolution: "postcss@npm:8.5.6"
   dependencies:
     nanoid: "npm:^3.3.11"
     picocolors: "npm:^1.1.1"
     source-map-js: "npm:^1.2.1"
-  checksum: 6415873fab84de05c2d8fd18f72ea6654bca437bb4b9f02ca819c438501e4b3a450023e575e17587c6eaa5bedddaaa4dad3af210f5cf166e30cec09cac58baf8
+  checksum: 5127cc7c91ed7a133a1b7318012d8bfa112da9ef092dddf369ae699a1f10ebbd89b1b9f25f3228795b84585c72aabd5ced5fc11f2ba467eedf7b081a66fad024
   languageName: node
   linkType: hard
 
@@ -3910,7 +3910,7 @@ __metadata:
     jasmine-browser-runner: "npm:^3.0.0"
     jasmine-core: "npm:^5.8.0"
     paste-html-to-govspeak: "npm:^0.5.0"
-    postcss: "npm:^8.5.5"
+    postcss: "npm:^8.5.6"
     standardx: "npm:^7.0.0"
     stylelint: "npm:^16.20.0"
     stylelint-config-gds: "npm:^2.0.0"