chore(deps): update dependency nunit to 4.5.1

Author: renovate[bot]

src/Directory.Packages.props

@@ -12,7 +12,7 @@
     <PackageVersion Include="ReactiveUI.Testing" Version="23.1.1" />
     <PackageVersion Include="ReactiveUI" Version="23.1.1" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
-    <PackageVersion Include="NUnit" Version="4.5.0" />
+    <PackageVersion Include="NUnit" Version="4.5.1" />
     <PackageVersion Include="NUnit3TestAdapter" Version="6.1.0" />
     <PackageVersion Include="NUnit.Analyzers" Version="4.11.2" />
     <PackageVersion Include="Verify.NUnit" Version="31.13.2" />