Update dependency NUnit to 4.6.0

Author: dependencyupdates[bot]

src/Directory.Packages.props

@@ -54,7 +54,7 @@
     <PackageVersion Include="NServiceBus.Transport.SqlServer" Version="9.0.1" />
     <PackageVersion Include="NServiceBus.Transport.IBMMQ" Version="1.0.1"/>
     <PackageVersion Include="NuGet.Versioning" Version="7.3.1" />
-    <PackageVersion Include="NUnit" Version="4.5.1" />
+    <PackageVersion Include="NUnit" Version="4.6.0" />
     <PackageVersion Include="NUnit.Analyzers" Version="4.13.0" />
     <PackageVersion Include="NUnit3TestAdapter" Version="6.2.0" />
     <PackageVersion Include="OpenTelemetry.Exporter.Console" Version="1.15.3" />