Update dependency NUnit to 4.4.0 (#2524)

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

Author: dependencyupdates[bot]

src/ServicePulse.Host.Tests/ServicePulse.Host.Tests.csproj

@@ -11,7 +11,7 @@
   <ItemGroup>
     <PackageReference Include="GitHubActionsTestLogger" Version="2.4.1" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
-    <PackageReference Include="NUnit" Version="4.2.2" />
+    <PackageReference Include="NUnit" Version="4.4.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="5.1.0" />
     <PackageReference Include="Particular.Approvals" Version="1.1.1" />
     <PackageReference Include="System.Text.Json" Version="8.0.5" />