Update xUnit and Microsoft.NET.Test.Sdk

[DennisDyallo]

Description

This updates test packages xUnit and Microsoft.Net.Test.Sdk

[github-actions]

Test Results: Windows

    2 files      2 suites   2s ⏱️
3 616 tests 3 616 ✅ 0 💤 0 ❌
3 618 runs  3 618 ✅ 0 💤 0 ❌

Results for commit 4ac896e.

[github-actions]

Test Results: Ubuntu

    2 files      2 suites   5s ⏱️
3 608 tests 3 608 ✅ 0 💤 0 ❌
3 610 runs  3 610 ✅ 0 💤 0 ❌

Results for commit 4ac896e.

[github-actions]

Test Results: MacOS

    2 files      2 suites   1s ⏱️
3 608 tests 3 608 ✅ 0 💤 0 ❌
3 610 runs  3 610 ✅ 0 💤 0 ❌

Results for commit 4ac896e.

[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
Yubico.Core	42%	31%	4257	➖
Yubico.YubiKey	51%	47%	18501	➖
Summary	49% (31624 / 64389)	45% (8038 / 18045)	22758	➖

Minimum allowed line rate is 40%