Bump NUnit3TestAdapter from 4.2.1 to 5.1.0

---
updated-dependencies:
- dependency-name: NUnit3TestAdapter
  dependency-version: 5.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

samples/snippets/core/testing/unit-testing-using-nunit/csharp/PrimeService.Tests/PrimeService.Tests.csproj

@@ -9,7 +9,7 @@
   <!--<snippetPackages>-->
   <ItemGroup>
     <PackageReference Include="nunit" Version="3.13.3" />
-    <PackageReference Include="NUnit3TestAdapter" Version="4.2.1" />
+    <PackageReference Include="NUnit3TestAdapter" Version="5.1.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.2.0" />
   </ItemGroup>
   <!--</snippetPackages>-->