Bump NUnit3TestAdapter across 2 directories (#56445)

---
updated-dependencies:
- dependency-name: NUnit3TestAdapter
  dependency-version: 6.3.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: nuget
- dependency-name: NUnit3TestAdapter
  dependency-version: 6.3.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: nuget
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

docs/core/testing/snippets/order-unit-tests/csharp/NUnit.TestProject/NUnit.Project.csproj

@@ -9,7 +9,7 @@
 
   <ItemGroup>
     <PackageReference Include="NUnit" Version="5.0.0" />
-    <PackageReference Include="NUnit3TestAdapter" Version="6.3.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="6.3.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.10.1" />
     <PackageReference Include="NUnit.Analyzers" Version="4.15.0">
         <PrivateAssets>all</PrivateAssets>