fix: Fix cache SQL query

lib/src/services/cache_http.dart

@@ -42,7 +42,7 @@ class CacheHttp {
         return response.body;
       } else {
         await this.db.rawInsert(
-            "INSERT INTO cache (url, resource) VALUES (?, ?) ON CONFLICT(url) DO UPDATE SET resource = ?",
+            "INSERT OR REPLACE INTO cache (url, resource) VALUES (?, ?)",
             [url, response.body, response.body]);
         return response.body;
       }