Environment

AppVeyor build

Build issue description

Starting from today, all the builds are breaking in AppVeyor because a vulnerability in WIX package v3 and due to build setting "Warning as error".
It seems that the vulnerability is fixed only in v4 (which is not an easy move).
Report: GHSA-7wh2-wxc7-9ph5
Nuget: https://www.nuget.org/packages/wix

Steps to reproduce

Build a PR.

Did this work in previous version of GitExtensions?

N/A