fix(deps): update dependency postcss to v8.5.6 (#2616)

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

Author: renovate[bot]

bun.lockb

@@ -53,7 +53,7 @@
   "dependencies": {
     "@node-minify/utils": "workspace:*",
     "cssnano": "^7.0.6",
-    "postcss": "8.5.5"
+    "postcss": "8.5.6"
   },
   "devDependencies": {
     "@node-minify/types": "workspace:*"