Cannot set voucher "Starting number" or reset sequence

Overview: Not able to change the voucher starting number in invoice settings or reset voucher number sequence.

Steps to Reproduce:

1. Log into FOLIO-snapshot or bugfest-juniper
2. Select settings
3. Select Invoices
4. Select Voucher number
5. input a value into the Starting number field
6. Click reset sequence

Expected Results: Starting number is saved and voucher sequence is reset and displays the next number in sequence as the number you input for "Starting number"

Actual Results: Start number could not be saved error is shown.

Additional Information: see link below to test
URL: https://folio-snapshot.dev.folio.org/settings/invoice/voucher-number

Error message for /voucher/voucher-number/start/1 :

Accept header must be ["text/plain"] for this request, but it is "application/json", can not send */*

The issue happens between mod-invoice and mod-invoice-storage: mod-invoice uses application/json as the Accept header, while mod-invoice-storage only accepts text/plain. If we want to allow application/json, mod-invoice-storage needs to be updated.

Interested parties: