chore(deps): update dependency svelte-preprocess to v4.9.8

Author: renovate-bot

package-lock.json

@@ -75,7 +75,7 @@
     "semantic-release": "17.4.7",
     "svelte": "3.29.4",
     "svelte-loader": "2.13.6",
-    "svelte-preprocess": "4.7.4",
+    "svelte-preprocess": "4.9.8",
     "typescript": "3.9.10",
     "webpack": "4.41.5"
   },