chore(deps): update dependency postcss to v8.5.5 (#759)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -78,7 +78,7 @@
     "mermaid": "^11.0.0",
     "neostandard": "^0.12.0",
     "npm-run-all2": "7.0.2",
-    "postcss": "8.5.4",
+    "postcss": "8.5.5",
     "postcss-html": "1.8.0",
     "postcss-scss": "4.0.9",
     "prettier": "3.4.2",