fix(fetch): correctly intercept requests with URL inputs

If `input` (first argument to fetch) is not a string, then
it can be a URL, which does not have a `.url` property
but does have a `.href` property

This fixes a type error and also fixes tests that
were failing in Node 18 without this fix.

src/interceptors/fetch/index.ts

@@ -40,7 +40,13 @@ export class FetchInterceptor extends Interceptor<HttpRequestEventMap> {
     globalThis.fetch = async (input, init) => {
       const request = new Request(input, init)
 
-      const url = typeof input === 'string' ? input : input.url
+      const url =
+        typeof input === 'string'
+          ? input
+          : input instanceof URL
+          ? input.href
+          : input.url
+
       const method = request.method
 
       this.log('[%s] %s', method, url)