Maintenance release

What's Changed

• Bump Octokit from 8.1.1 to 9.0.0 by @dependabot in #526
• Bump xunit from 2.6.0 to 2.6.1 by @dependabot in #528
• Upgrade Wix Toolset to version 4 by @Lolle2000la in #529

Full Changelog: v2.12.4...v2.12.5