Update dependency Microsoft.NET.Test.Sdk to v18

Author: renovate[bot]

Emulsion.Tests/Emulsion.Tests.fsproj

@@ -36,7 +36,7 @@ SPDX-License-Identifier: MIT
     <Compile Include="Web\ContentControllerTests.fs" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
     <PackageReference Include="Serilog.Sinks.TestCorrelator" Version="4.0.0" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />