Fix for Verify.Xunit, Update Avalonia version

[ChrisPulman]

What kind of change does this PR introduce?

Fix for Verify.Xunit Update Avalonia version

What is the current behavior?

Verify.Xunit and Avalonia versions are not the latest updating Verify.Xunit requires code fixes to enable build

What is the new behavior?

Verify.Xunit and Avalonia versions are updated

What might this PR break?

Avalonia will need to be migrated to the latest version.

Please check if the PR fulfills these requirements

• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

Other information:

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