converters/wkhtmltopdf: update 0.12.4 -> 0.12.5, unbreak

• take maintainer

PR: 228968, 228732
Submitted by: truckman, pi
Reviewed by: Ashish Kulkarni <kulkarni.ashish@gmail.com> (upstream)
Approved by: mm (maintainer)
Relnotes: https://github.com/wkhtmltopdf/wkhtmltopdf/releases