Update dependency coverlet.msbuild to v6

Author: renovate[bot]

Source/Cake.DotNetVersionDetector.Tests/Cake.DotNetVersionDetector.Tests.csproj

@@ -9,7 +9,7 @@
   <ItemGroup>
     <PackageReference Include="Cake.Testing" Version="1.0.0" />
     <PackageReference Include="Cake.Testing.Xunit" Version="1.0.0" />
-    <PackageReference Include="coverlet.msbuild" Version="3.2.0">
+    <PackageReference Include="coverlet.msbuild" Version="6.0.2">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>