Chore: 2.9.0

# [2.9.0](v2.8.16...v2.9.0) (2023-01-17)

## New
* Added Guest Role
* Added Guest Role

src/Tree/Tree.csproj

-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 	<PropertyGroup>
 		<OutputType>Exe</OutputType>
 		<RootNamespace>Coscine.Api.Tree</RootNamespace>
 		<AssemblyName>Coscine.Api.Tree</AssemblyName>
 		<GenerateDocumentationFile>true</GenerateDocumentationFile>
 		<TargetFramework>net6.0</TargetFramework>
-		<Version>2.8.16</Version>
+		<Version>2.9.0</Version>
 	</PropertyGroup>
 	<PropertyGroup>
 		<Authors>RWTH Aachen University</Authors>