fix voucher file upload path

[Sysix]

closes #145

[github-actions]

Coverage report for commit: 130f8e4
File: coverage.xml

Cover ┌─────────────────────────┐ Freq.
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  10% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  20% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  30% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  40% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  50% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  60% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  70% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  80% │ ░░░░░░░░░░░░░░░░░░░░░░░ │  0.0%
  90% │ █░░░░░░░░░░░░░░░░░░░░░░ │  2.8%
 100% │ ███████████████████████ │ 97.2%
      └─────────────────────────┘
 *Legend:* █ = Current Distribution 

Summary - Lines: 98.67% | Methods: 95.00%

Files	Lines	Methods	Branches
src
Api.php	100.00%	100.00%	100.00%
BaseClient.php	100.00%	100.00%	100.00%
PaginationClient.php	96.67%	75.00%	100.00%
Utils.php	96.30%	83.33%	100.00%
src/Clients
Contact.php	100.00%	100.00%	100.00%
Country.php	100.00%	100.00%	100.00%
CreditNote.php	100.00%	100.00%	100.00%
DeliveryNote.php	100.00%	100.00%	100.00%
DownPaymentInvoice.php	100.00%	100.00%	100.00%
Dunning.php	100.00%	100.00%	100.00%
Event.php	100.00%	100.00%	100.00%
File.php	100.00%	100.00%	100.00%
Invoice.php	100.00%	100.00%	100.00%
OrderConfirmation.php	100.00%	100.00%	100.00%
Payment.php	100.00%	100.00%	100.00%
PaymentCondition.php	100.00%	100.00%	100.00%
PostingCategory.php	100.00%	100.00%	100.00%
Profile.php	100.00%	100.00%	100.00%
Quotation.php	100.00%	100.00%	100.00%
RecurringTemplate.php	100.00%	100.00%	100.00%
Voucher.php	100.00%	100.00%	100.00%
VoucherList.php	100.00%	100.00%	100.00%
src/Clients/Traits
CreateFinalizeTrait.php	100.00%	100.00%	100.00%
CreateTrait.php	100.00%	100.00%	100.00%
DeleteTrait.php	100.00%	100.00%	100.00%
DocumentClientTrait.php	91.67%	-	100.00%
GetTrait.php	100.00%	100.00%	100.00%
PursueFinalizeTrait.php	100.00%	100.00%	100.00%
PursueTrait.php	100.00%	100.00%	100.00%
UpdateTrait.php	100.00%	100.00%	100.00%
VoucherListTrait.php	100.00%	100.00%	100.00%
src/Config/FileClient
VoucherConfig.php	100.00%	100.00%	100.00%
src/Config
FileClientConfig.php	100.00%	100.00%	100.00%
src/Exceptions
LexOfficeApiException.php	100.00%	100.00%	100.00%
src/Interfaces
ApiInterface.php	100.00%	100.00%	100.00%
ClientInterface.php	100.00%	100.00%	100.00%

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