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MINOR: [C#] Bump xunit from 2.4.0 to 2.5.0 in /csharp (#37424)

Bumps [xunit](https://github.com/xunit/xunit) from 2.4.0 to 2.5.0.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/xunit/xunit/commit/12ec6b87aea7ad0496aa053e11b84d4c928f90a8"><code>12ec6b8</code></a> Bump up to v2.5.1-pre</li>
<li><a href="https://github.com/xunit/xunit/commit/92f31c4c3a4adf391a19e6c9b531f4195636f132"><code>92f31c4</code></a> v2.5.0</li>
<li><a href="https://github.com/xunit/xunit/commit/188216b64a3bb9a141cb2851fce47264f29593bf"><code>188216b</code></a> Ensure both failed tests and error cause error return codes (and cancel for s...</li>
<li><a href="https://github.com/xunit/xunit/commit/c97317920dcd10e88264adf6c81a303aca7bfc06"><code>c973179</code></a> Latest analyzers</li>
<li><a href="https://github.com/xunit/xunit/commit/f93d52dbf743957131287690bef34a518c402eae"><code>f93d52d</code></a> Propagate StopOnFail from config file =&gt; execution options</li>
<li><a href="https://github.com/xunit/xunit/commit/5e70f54cab281f0d19ababd6dea9832518137a4d"><code>5e70f54</code></a> <a href="https://redirect.github.com/xunit/xunit/issues/2737">#2737</a>: Restore XunitException constructor (breaking change) (v2)</li>
<li><a href="https://github.com/xunit/xunit/commit/028866f82155319ffa583503245aa5ec438f7804"><code>028866f</code></a> Add PackageDownload for Microsoft.NETFramework.ReferenceAssemblies.net452 to ...</li>
<li><a href="https://github.com/xunit/xunit/commit/aeba1bbfc354d24ce2ddb17e1d248bf5ddf7b4cc"><code>aeba1bb</code></a> Remove UAP/UWP support</li>
<li><a href="https://github.com/xunit/xunit/commit/530802128e5acd624406f35869ab61d73d6c0514"><code>5308021</code></a> <a href="https://redirect.github.com/xunit/xunit/issues/1857">#1857</a>: Add overload to Assert.Contains for ConcurrentDictionary (v2)</li>
<li><a href="https://github.com/xunit/xunit/commit/5fbaa0a34994a5293589c47935bfbfe49b29357c"><code>5fbaa0a</code></a> Incorrect type restriction on obsoleted Assert.ThrowsAny&lt;T&gt; for Func&lt;Task&gt; an...</li>
<li>Additional commits viewable in <a href="https://github.com/xunit/xunit/compare/2.4...2.5.0">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>