security/yubikey-agent: Fix build on 32-bit platforms
This imports an upstream patch from dependency
github.com/go-piv/piv-go to address a missing cast.
See also: https://github.com/go-piv/piv-go/commit/1902689552e974ba88750e3ab71902d253172ead
PR: 267197
Approved by: maintainer timeout, >2 weeks
MFH: 2022Q4