Bump Microsoft.NET.Test.Sdk from 17.12.0 to 18.0.1 (#34)

Author: dependabot[bot]

tests/CloudflareExtension.Tests.csproj

@@ -9,7 +9,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
     <PackageReference Include="MSTest.TestAdapter" Version="3.6.4" />
     <PackageReference Include="MSTest.TestFramework" Version="3.6.4" />
     <PackageReference Include="Moq" Version="4.20.72" />