net/arataga: Fix compatibility with fmt 10+

Partially backport upstream commit
62f65e0842985750697476cc59b830205b7b4826 to fix build with fmt 10+

Reference:
https://github.com/Stiffstream/arataga/commit/62f65e0842985750697476cc59b830205b7b4826.patch

PR: 273878
Approved by: portmgr (maintainer timeout, 3+ weeks)
Sponsored by: Blinkinblox