chore(deps): update dependency svelte-preprocess to v6

Author: renovate[bot]

pnpm-lock.yaml

@@ -19,7 +19,7 @@
     "svelte": "^3.59.2",
     "svelte-check": "^3.8.6",
     "svelte-loader": "^3.2.4",
-    "svelte-preprocess": "^5.1.4",
+    "svelte-preprocess": "^6.0.3",
     "tslib": "^2.8.1",
     "typescript": "^5.8.3",
     "webpack-bundle-analyzer": "4.10.2"