chore(deps): update cake monorepo to v6

Author: renovate[bot]

src/Cake.AppVeyor.Tests/Cake.AppVeyor.Tests.csproj

@@ -5,7 +5,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Cake.Testing" Version="5.0.0" />
+    <PackageReference Include="Cake.Testing" Version="6.0.0" />
     <PackageReference Include="coverlet.msbuild" Version="6.0.4">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>

src/Cake.AppVeyor/Cake.AppVeyor.csproj

@@ -32,8 +32,8 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Cake.Common" Version="5.0.0" PrivateAssets="All" />
-    <PackageReference Include="Cake.Core" Version="5.0.0" PrivateAssets="All" />
+    <PackageReference Include="Cake.Common" Version="6.0.0" PrivateAssets="All" />
+    <PackageReference Include="Cake.Core" Version="6.0.0" PrivateAssets="All" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>