fix: invalid headers access when using nativeFetch

Remix v2.9+ now supports `undici` native fetch. `normalizeRemixRequest()` would throw an error when processing `headers`. This PR uses the standard `Object.fromEntries()` to convert `Headers` into an object.

Author: kiliman

packages/remix/src/utils/web-fetch.ts

@@ -147,8 +147,8 @@ export const normalizeRemixRequest = (request: RemixRequest): Record<string, any
     query: parsedURL.query,
     href: parsedURL.href,
     method: request.method,
-    // @ts-expect-error - not sure what this supposed to do
-    headers: headers[Symbol.for('nodejs.util.inspect.custom')](),
+    // Remix now uses undici, so use standard way to create headers object
+    headers: Object.fromEntries(headers),
     insecureHTTPParser: request.insecureHTTPParser,
     agent,