Update dependency Microsoft.NET.Test.Sdk to 18.3.0

Author: dependencyupdates[bot]

src/ServicePulse.Tests/ServicePulse.Tests.csproj

@@ -14,7 +14,7 @@
   <ItemGroup>
     <PackageReference Include="GitHubActionsTestLogger" Version="3.0.1" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.2" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
     <PackageReference Include="NUnit" Version="4.5.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="6.1.0" />
   </ItemGroup>