chore(deps): update dependency xunit.runner.visualstudio to v2.5.7

| datasource | package                   | from  | to    |
| ---------- | ------------------------- | ----- | ----- |
| nuget      | xunit.runner.visualstudio | 2.5.6 | 2.5.7 |

Author: renovate[bot]

OpenXmlPowerTools.Tests/OpenXmlPowerTools.Tests.csproj

@@ -8,7 +8,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
     <PackageReference Include="xunit" Version="2.6.6" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6">
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.7">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>