Update cake monorepo to v5

Author: renovate[bot]

src/Cake.Markdownlint.Tests/Cake.Markdownlint.Tests.csproj

@@ -16,8 +16,8 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
-    <PackageReference Include="Cake.Core" Version="4.0.0" />
-    <PackageReference Include="Cake.Testing" Version="4.0.0" />
+    <PackageReference Include="Cake.Core" Version="5.0.0" />
+    <PackageReference Include="Cake.Testing" Version="5.0.0" />
     <PackageReference Include="Shouldly" Version="4.3.0" />
     <PackageReference Include="StyleCop.Analyzers" Version="1.1.118" />
     <PackageReference Include="xunit" Version="2.9.3" />

src/Cake.Markdownlint/Cake.Markdownlint.csproj

@@ -17,7 +17,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Cake.Core" Version="4.0.0">
+    <PackageReference Include="Cake.Core" Version="5.0.0">
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
     <PackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="9.0.0">