chore(deps): update dependency microsoft.net.test.sdk to v18

Author: renovate[bot]

ScipDotnet.Tests/ScipDotnet.Tests.csproj

@@ -9,7 +9,7 @@
 
     <ItemGroup>
         <PackageReference Include="DiffPlex" Version="1.7.1" />
-        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.1.0" />
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
         <PackageReference Include="NUnit" Version="3.13.3" />
         <PackageReference Include="NUnit3TestAdapter" Version="5.0.0" />
         <PackageReference Include="NUnit.Analyzers" Version="3.3.0" />