fix: vector stores file batch cancel payload

Author: TyperEJ

src/Resources/VectorStoresFileBatches.php

@@ -70,7 +70,7 @@ public function listFiles(string $vectorStoreId, string $fileBatchId, array $par
      */
     public function cancel(string $vectorStoreId, string $fileBatchId): VectorStoreFileBatchResponse
     {
-        $payload = Payload::delete("vector_stores/$vectorStoreId/file_batches", $fileBatchId);
+        $payload = Payload::cancel("vector_stores/$vectorStoreId/file_batches", $fileBatchId);
 
         /** @var Response<array{id: string, object: string, created_at: int, vector_store_id: string, status: string, file_counts: array{in_progress: int, completed: int, failed: int, cancelled: int, total: int}}> $response */
         $response = $this->transporter->requestObject($payload);

tests/Resources/VectorStoresFileBatches.php

@@ -44,7 +44,7 @@
 });
 
 test('cancel', function () {
-    $client = mockClient('DELETE', 'vector_stores/vs_abc123/file_batches/vsfb_abc123', [], Response::from(vectorStoreFileBatchResource(), metaHeaders()));
+    $client = mockClient('POST', 'vector_stores/vs_abc123/file_batches/vsfb_abc123/cancel', [], Response::from(vectorStoreFileBatchResource(), metaHeaders()));
 
     $result = $client->vectorStores()->batches()->cancel('vs_abc123', 'vsfb_abc123');