Update dependency xunit.analyzers to 1.18.0

Author: renovate[bot]

src/Cake.AsciiDoctorJ.Tests/Cake.AsciiDoctorJ.Tests.csproj

@@ -33,7 +33,7 @@
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
         <PackageReference Include="xunit" Version="2.9.2" />
-        <PackageReference Include="xunit.analyzers" Version="1.17.0" />
+        <PackageReference Include="xunit.analyzers" Version="1.18.0" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
             <PrivateAssets>all</PrivateAssets>