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MINOR: [C#] Bump xunit.runner.visualstudio from 2.5.8 to 2.8.0 in /csharp (#41441)

Bumps [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit) from 2.5.8 to 2.8.0.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/xunit/visualstudio.xunit/commit/6438bb880aad83e89e79ad06a42bc8d5cd4d3f86"><code>6438bb8</code></a> v2.8.0</li>
<li><a href="https://github.com/xunit/visualstudio.xunit/commit/2afd4cd1ab3a92d32285ee7da796d2ed146af5eb"><code>2afd4cd</code></a> Pick up latest dependencies</li>
<li><a href="https://github.com/xunit/visualstudio.xunit/commit/b8be108a08605d527fb6a99f298f6b06ca6f1ccc"><code>b8be108</code></a> Add multiplier format support to RunSettings</li>
<li><a href="https://github.com/xunit/visualstudio.xunit/commit/3c2e493f1691e245cd1a93daaf422c9d627ec35d"><code>3c2e493</code></a> Update to 2.7.2-pre.17 and support Xunit.ParallelAlgorithm in RunSetttings</li>
<li><a href="https://github.com/xunit/visualstudio.xunit/commit/144931ee8d49af5e206604fcb230013efc35a0d4"><code>144931e</code></a> Missing height on version</li>
<li><a href="https://github.com/xunit/visualstudio.xunit/commit/431592110738aa93aca90e90c6ca17ee7a6d2ea0"><code>4315921</code></a> Fix concurrency bug in AssemblyHelper (<a href="https://redirect.github.com/xunit/visualstudio.xunit/issues/407">#407</a>)</li>
<li><a href="https://github.com/xunit/visualstudio.xunit/commit/861739361d614e170d33be20249c205a3c577cff"><code>8617393</code></a> Bump up to 2.5.9-pre</li>
<li>See full diff in <a href="https://github.com/xunit/visualstudio.xunit/compare/2.5.8...2.8.0">compare view</a></li>
</ul>
</details>
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Authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Signed-off-by: Curt Hagenlocher <curt@hagenlocher.org>