chore(deps): update cake monorepo to v6

Author: renovate[bot]

Source/Cake.Coveralls.Tests/Cake.Coveralls.Tests.csproj

@@ -10,8 +10,8 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Cake.Core" Version="4.0.0" />
-    <PackageReference Include="Cake.Testing" Version="4.0.0" />
+    <PackageReference Include="Cake.Core" Version="6.0.0" />
+    <PackageReference Include="Cake.Testing" Version="6.0.0" />
     <PackageReference Include="coverlet.msbuild" Version="6.0.2">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>

Source/Cake.Coveralls/Cake.Coveralls.csproj

@@ -36,7 +36,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="Cake.Core" Version="4.0.0" PrivateAssets="All" />
+    <PackageReference Include="Cake.Core" Version="6.0.0" PrivateAssets="All" />
     <PackageReference Include="CakeContrib.Guidelines" Version="1.5.1">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>