fix(curriculum) : stringify uncloneable search params in Basic Node Post Challenge (#66132)

Co-authored-by: majestic-owl448 <26656284+majestic-owl448@users.noreply.github.com>

curriculum/challenges/english/blocks/basic-node-and-express/587d7fb2367417b2b2512bf8.md

@@ -36,7 +36,7 @@ Test 1 : Your API endpoint should respond with the correct name
     headers: {
       'Content-Type': 'application/x-www-form-urlencoded'
     },
-    body: new URLSearchParams({ first: 'Mick', last: 'Jagger' })
+    body: new URLSearchParams({ first: 'Mick', last: 'Jagger' }).toString()
   });
   if (!response.ok) {
     throw new Error(await response.text());
@@ -60,7 +60,7 @@ Test 2 : Your API endpoint should respond with the correct name
     body: new URLSearchParams({
       first: 'Keith',
       last: 'Richards'
-    })
+    }).toString()
   });
   if (!response.ok) {
     throw new Error(await response.text());