chore(deps): update dependency postcss to v8.5.8 (#7999)

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

Author: renovate[bot]

package-lock.json

@@ -24,7 +24,7 @@
     "@types/react": "19.2.14",
     "estree-util-value-to-estree": "3.5.0",
     "pagefind": "^1.3.0",
-    "postcss": "8.5.6",
+    "postcss": "8.5.8",
     "postcss-import": "16.1.1",
     "postcss-lightningcss": "1.0.2",
     "tailwindcss": "3.4.19",