Bump NUnit3TestAdapter (#1891)

Bumps [NUnit3TestAdapter](https://github.com/nunit/nunit3-vs-adapter) from 3.15.1 to 3.16.0.
- [Release notes](https://github.com/nunit/nunit3-vs-adapter/releases)
- [Commits](nunit/nunit3-vs-adapter@V3.15.1...V3.16)

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

Author: dependabot-preview[bot]

core/getting-started/unit-testing-using-nunit/PrimeService.Tests/PrimeService.Tests.csproj

@@ -9,7 +9,7 @@
   <!--<snippetPackages>-->
   <ItemGroup>
     <PackageReference Include="nunit" Version="3.12.0" />
-    <PackageReference Include="NUnit3TestAdapter" Version="3.15.1" />
+    <PackageReference Include="NUnit3TestAdapter" Version="3.16.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.4.0" />
   </ItemGroup>
   <!--</snippetPackages>-->