Update dependency NUnit to 4.5.1 (#5348)

Co-authored-by: dependencyupdates[bot] <218638057+dependencyupdates[bot]@users.noreply.github.com>

Author: dependencyupdates[bot]

src/Directory.Packages.props

@@ -53,7 +53,7 @@
     <PackageVersion Include="NServiceBus.Transport.PostgreSql" Version="9.0.0" />
     <PackageVersion Include="NServiceBus.Transport.SqlServer" Version="9.0.0" />
     <PackageVersion Include="NuGet.Versioning" Version="7.3.0" />
-    <PackageVersion Include="NUnit" Version="4.5.0" />
+    <PackageVersion Include="NUnit" Version="4.5.1" />
     <PackageVersion Include="NUnit.Analyzers" Version="4.11.2" />
     <PackageVersion Include="NUnit3TestAdapter" Version="6.1.0" />
     <PackageVersion Include="OpenTelemetry.Exporter.Console" Version="1.15.0" />