Merge pull request #412 from jenkinsci/dependabot/npm_and_yarn/postcss-8.5.6

Bump postcss from 8.5.3 to 8.5.6

Author: uhafner

package.json

@@ -15,7 +15,7 @@
     "rtlcss": "4.3.0",
     "sass": "1.89.2",
     "npm-run-all2": "8.0.1",
-    "postcss": "8.5.3",
+    "postcss": "8.5.6",
     "postcss-cli": "11.0.1",
     "remark-cli": "12.0.1",
     "remark-lint": "10.0.1",