fix: multipart replication with single part objects (#20895)

x-amz-checksum-algorithm is not set, causing all multipart single-part objects
to fail to replicate going via sftp/FTP uploads.

cmd/ftp-server-driver.go

@@ -552,6 +552,7 @@ func (driver *ftpDriver) PutFile(ctx *ftp.Context, objPath string, data io.Reade
 	info, err := clnt.PutObject(context.Background(), bucket, object, data, -1, minio.PutObjectOptions{
 		ContentType:          mimedb.TypeByExtension(path.Ext(object)),
 		DisableContentSha256: true,
+		Checksum:             minio.ChecksumFullObjectCRC32C,
 	})
 	n = info.Size
 	return n, err