fix: correct the passing of the signal option (#610)

Author: wolfy1339

src/fetch-wrapper.ts

@@ -40,7 +40,7 @@ export default function fetchWrapper(
     method: requestOptions.method,
     body: requestOptions.body,
     headers: requestOptions.headers as HeadersInit,
-    signal: (requestOptions as any).signal,
+    signal: requestOptions.request?.signal,
     // duplex must be set if request.body is ReadableStream or Async Iterables.
     // See https://fetch.spec.whatwg.org/#dom-requestinit-duplex.
     ...(requestOptions.body && { duplex: "half" }),