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MINOR: [C#] Bump xunit from 2.6.1 to 2.6.2 in /csharp (#38801)

Bumps [xunit](https://github.com/xunit/xunit) from 2.6.1 to 2.6.2.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/xunit/xunit/commit/f69c77d4289be26085fa8fe6cb53f5cabac4f7b4"><code>f69c77d</code></a> v2.6.2</li>
<li><a href="https://github.com/xunit/xunit/commit/9ef018a84156a3b5aae91953cbb0a4da1e7d3f13"><code>9ef018a</code></a> Latest dependencies</li>
<li><a href="https://github.com/xunit/xunit/commit/dc28c5de21954f65cb0d2fc6e108b3eb4f10419a"><code>dc28c5d</code></a> Add -silent reporter which does not output anything</li>
<li><a href="https://github.com/xunit/xunit/commit/9cbad9a36155749119f177b4749cc6b37bfd72b1"><code>9cbad9a</code></a> Unit tests for <a href="https://redirect.github.com/xunit/xunit/issues/2821">#2821</a> (v2)</li>
<li><a href="https://github.com/xunit/xunit/commit/e25a79e7a067899a9ad3b5b250da35ef2aa57e2d"><code>e25a79e</code></a> Missing assemblies for net6.0</li>
<li><a href="https://github.com/xunit/xunit/commit/95954e3574e944d2d23aedc440c470efb33d0899"><code>95954e3</code></a> Put net6.0 DLL into xunit.runner.console NuGet package</li>
<li><a href="https://github.com/xunit/xunit/commit/6ec181e99d954b39da5f41858f5093362d2ca1ee"><code>6ec181e</code></a> Disable warnings about out-of-support versions of .NET Core</li>
<li><a href="https://github.com/xunit/xunit/commit/6d1bc075fcaedaa5233ad077a437898830c8b137"><code>6d1bc07</code></a> Only print max threads when parallel test collections is on</li>
<li><a href="https://github.com/xunit/xunit/commit/d300c8850978195b6e78d3cba17b78bb8a4e68f4"><code>d300c88</code></a> <a href="https://redirect.github.com/xunit/visualstudio.xunit/issues/392">xunit/visualstudio.xunit#392</a>: stopOnFail is ignored when synchronous message ...</li>
<li><a href="https://github.com/xunit/xunit/commit/4e99b52d8e7a480e9ede44db8e25687ff26fc6b7"><code>4e99b52</code></a> Use on/off for stop on fail banner display</li>
<li>Additional commits viewable in <a href="https://github.com/xunit/xunit/compare/2.6.1...2.6.2">compare view</a></li>
</ul>
</details>
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Authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>