build(deps): bump xunit.runner.visualstudio from 2.5.4 to 2.5.6 in /integrationtests (#3708)

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Bumps
[xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit)
from 2.5.4 to 2.5.6.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/xunit/visualstudio.xunit/commit/bf9b858c26abf12bbac8794c875cef4352b41e5a"><code>bf9b858</code></a>
v2.5.6</li>
<li><a
href="https://github.com/xunit/visualstudio.xunit/commit/b05cd381bd774a1ed95be6a7bd887a747da6deb3"><code>b05cd38</code></a>
Latest dependencies</li>
<li><a
href="https://github.com/xunit/visualstudio.xunit/commit/342393753fcacc4f8b96e3e2d4679da085e3f9e4"><code>3423937</code></a>
Experiment: Rename adapter assembly</li>
<li><a
href="https://github.com/xunit/visualstudio.xunit/commit/0e604e42f6039e85a034a65b101cc467ac59ed09"><code>0e604e4</code></a>
Experiment: Remove all file copies</li>
<li><a
href="https://github.com/xunit/visualstudio.xunit/commit/6dff7574a83bf209b964866caca44826bc618cac"><code>6dff757</code></a>
Bump up to v2.5.6-pre</li>
<li><a
href="https://github.com/xunit/visualstudio.xunit/commit/28b46ff510a2846342ea1756a32c2a14d17b9938"><code>28b46ff</code></a>
v2.5.5</li>
<li><a
href="https://github.com/xunit/visualstudio.xunit/commit/409be7a45f67ce0578c912340c3d5320c7246b62"><code>409be7a</code></a>
Add PackageId to solve VS issues (see <a
href="https://redirect.github.com/dotnet/sdk/issues/22">dotnet/sdk#22</a>...</li>
<li><a
href="https://github.com/xunit/visualstudio.xunit/commit/56db5de6cece6ca1341664ceece0a1e186dceca8"><code>56db5de</code></a>
Latest dependencies (and use ExecutionSink instead of delegating
sinks)</li>
<li><a
href="https://github.com/xunit/visualstudio.xunit/commit/1f419e62a61cbbfbcf06b7dd4d0022dafe7299f5"><code>1f419e6</code></a>
Update README</li>
<li><a
href="https://github.com/xunit/visualstudio.xunit/commit/f052a1dfa46cee7faf8d5af54bec69aaaececb41"><code>f052a1d</code></a>
Bump up to v2.5.5-pre</li>
<li>See full diff in <a
href="https://github.com/xunit/visualstudio.xunit/compare/2.5.4...2.5.6">compare
view</a></li>
</ul>
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integrationtests/IntegrationTests.Shared.Tests/IntegrationTests.Shared.Tests.csproj

@@ -14,7 +14,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.4">
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>