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

| datasource | package                | from    | to     |
| ---------- | ---------------------- | ------- | ------ |
| nuget      | Microsoft.NET.Test.Sdk | 17.14.1 | 18.0.0 |

Author: renovate[bot]

NCrontab.Advanced.Tests/NCrontab.Advanced.Tests.csproj

@@ -12,7 +12,7 @@
   <ItemGroup>
     <ProjectReference Include="..\NCrontab.Advanced\NCrontab.Advanced.csproj" />
     <PackageReference Include="JunitXml.TestLogger" Version="7.0.2" />
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
     <PackageReference Include="MSTest.TestFramework" Version="3.11.0" />
     <PackageReference Include="MSTest.TestAdapter" Version="3.11.0" />
   </ItemGroup>