Bigger symbol stack so actual stack might overflow

src/fuzz.cpp

@@ -35,7 +35,7 @@ std::pair<std::string, WeaselJsonStatus> runBatch(std::string copy) {
   SerializeState state;
   auto c = serializeCallbacks();
   std::unique_ptr<WeaselJsonParser, decltype(&WeaselJsonParser_destroy)> parser{
-      WeaselJsonParser_create(1024, &c, &state,
+      WeaselJsonParser_create(1 << 20, &c, &state,
                               copy.size() % 2 == 0 ? WeaselJsonRaw : 0),
       WeaselJsonParser_destroy};
   auto s = WeaselJsonParser_parse(parser.get(), copy.data(), copy.size());