chore(deps): update dependency postcss-load-config to v6 (#276)

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

Author: renovate[bot]

pnpm-lock.yaml

@@ -15,7 +15,7 @@
     "@types/node": "^22.14.1",
     "cross-env": "^7.0.3",
     "html-rspack-plugin": "^6.0.5",
-    "postcss-load-config": "4.0.2",
+    "postcss-load-config": "6.0.1",
     "svelte": "^3.59.2",
     "svelte-check": "^3.8.6",
     "svelte-loader": "^3.2.4",