Update dependency CakeContrib.Guidelines to 1.6.1

Author: renovate[bot]

src/Cake.BuildSystems.Module/Cake.BuildSystems.Module.csproj

@@ -58,7 +58,7 @@
     </ItemGroup>
 
     <ItemGroup>
-      <PackageReference Include="CakeContrib.Guidelines" Version="1.5.1">
+      <PackageReference Include="CakeContrib.Guidelines" Version="1.6.1">
         <PrivateAssets>all</PrivateAssets>
         <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       </PackageReference>