Bump NUnit3TestAdapter from 5.0.0 to 5.1.0 (#135)

Updated [NUnit3TestAdapter](https://github.com/nunit/nunit3-vs-adapter)
from 5.0.0 to 5.1.0.

<details>
<summary>Release notes</summary>

_Sourced from [NUnit3TestAdapter's
releases](https://github.com/nunit/nunit3-vs-adapter/releases)._

## 5.1.0

See [release
notes](https://docs.nunit.org/articles/vs-test-adapter/AdapterV4-Release-Notes.html)

Commits viewable in [compare
view](nunit/nunit3-vs-adapter@V5.0.0...5.1.0).
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Tests/Tests.csproj

@@ -31,7 +31,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="NUnit3TestAdapter" Version="5.0.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="5.1.0" />
     <PackageReference Include="System.IO.Abstractions" Version="22.0.15" />
     <PackageReference Include="System.IO.Abstractions.TestingHelpers" Version="22.0.15" />
   </ItemGroup>