Update NUnit dependency to 4.5.0 (tests only)

skip-release-and-release-note: true
GitOrigin-RevId: fc64c791cfa84c13e2f611b0d75c602d9944f6dc

Author: Octobob

source/Octopus.Client.E2ETests/Octopus.Client.E2ETests.csproj

@@ -24,7 +24,7 @@
     <ItemGroup>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
         <PackageReference Include="NSubstitute" Version="5.3.0" />
-        <PackageReference Include="NUnit" Version="4.4.0" />
+        <PackageReference Include="NUnit" Version="4.5.0" />
         <PackageReference Include="NUnit3TestAdapter" Version="6.1.0" NoWarn="NU1701" /> <!-- This package only targets legacy .NET desktop, but it still works on netcore so we force past the warning -->
         <PackageReference Include="TeamCity.VSTest.TestAdapter" Version="1.0.41" NoWarn="NU1701" /> <!-- This package only targets legacy .NET desktop, but it still works on netcore so we force past the warning -->
         <PackageReference Include="FluentAssertions" Version="7.2.1" />

source/Octopus.Client.Tests/Octopus.Client.Tests.csproj

@@ -36,7 +36,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
-    <PackageReference Include="NUnit" Version="4.4.0" />
+    <PackageReference Include="NUnit" Version="4.5.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="6.1.0" NoWarn="NU1701" /> <!-- This package only targets legacy .NET desktop, but it still works on netcore so we force past the warning -->
     <PackageReference Include="TeamCity.VSTest.TestAdapter" Version="1.0.41" NoWarn="NU1701" /> <!-- This package only targets legacy .NET desktop, but it still works on netcore so we force past the warning -->
     <PackageReference Include="Autofac" Version="9.0.0" />